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# 55

Number 55 (fifty-five) is an odd two-digits composite number and natural number following 54 and preceding 56.

## Properties of the number 55

 Nominal 55 Cardinal fifty-five Ordinal 55th Number of digits 2 Sum of digits 10 Product of digits 25 Number parity Odd
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## Prime Factorization of 55

 Prime factorization 5 x 11 Prime factors 5, 11 Number of distinct prime factors ω(n) 2 Total number of prime factors Ω(n) 2 Sum of prime factors 16 Product of prime factors 55
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## Divisors of 55

 List of proper divisors 1, 5, 11 List of all dividers 1, 5, 11, 55 Number of divisors d(n) 4 Sum of all divisors σ(n) 72 Aliquot sum 17 55 is a deficient number , since it is larger than the sum of its proper divisors (17). Its deficiency is 38.
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## Prime numbers

 Is 55 a prime number? No Is 55 a semiprime number? Yes Is 55 a Chen prime number? No Is 55 a Mersenne prime number? No
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## Sequences

 Is 55 a Catalan number? No Is 55 a Fibonacci number? Yes Is 55 a Idoneal number? No
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## Number theory

Number theory is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions.
 55 is not a Happy number 55 is not a Humble number 55 is not a Münchhausen number 55 is not a Perfect number 55 is not a Perfect square 55 is a Palindrome
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## Numeric Bases of 55

In mathematics, a base or radix of a numeral system is the number of unique digits, including zero, used to represent numbers in that system.
BaseSystemValue
2Binary1101112
3Ternary20013
4Quaternary3134
5Quinary2105
6Senary1316
7Septenary1067
8Octal678
9Nonary619
10Decimal55
12Duodecimal4712
20Vigesimal2f20
36Base361j36
60Sexagesimalt60
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## Mathematical operations

Mathematical operations are actions that are performed on numbers or mathematical expressions to find a numerical result.
 Square of 55 (n2) 3025 Cube of 55 (n3) 166375 Square root of 55 7.4162 Natural Logarithm (ln) of 55 4.00733 Decimal Logarithm (log) of 55 1.74036
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## Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
 Sine of 55 -0.999755 Cosecant of 55 -1.00024 Cosine of 55 0.0221268 Secant of 55 45.1942 Tangent of 55 -45.1831 Cotangent of 55 -0.0221322
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## Number parity

Parity is the property of an integer of whether it is even or odd.

No

### Is 55 an Odd Number?

Yes, the number 55 is an odd number.
Total number of all odd numbers from 1 to 55 is 28
Sum of all the odd numbers from 1 to 55 are 784
The sum of all odd numbers is a perfect square: 784 = 28
An odd number is any integer (a whole number) that cannot be divided by 2 evenly. Odd numbers are the opposite of even numbers.
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## Ban number

In recreational mathematics, a ban number is a number that does not contain a particular letter when spelled out in English; in other words, the letter is "banned".
 The spelling of 55 in words is "fifty-five", meaning that: 55 is an aban number (a number without the letter a) 55 is not an eban number (as it contains the letter e) 55 is not an iban number (as it contains the letter i) 55 is an oban number (a number without the letter o) 55 is not a tban number (as it contains the letter t) 55 is an uban number (a number without the letter u)
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## Numeral systems

How to write 55 in other number systems?
 Bengali numerals ৫৫ Eastern Arabic numerals ٥٥ Hieroglyphs numeralsused in Ancient Egypt 𓎊𓏾 Khmer numerals ៥៥ Japanese numerals 五十五 Roman numerals LV Thai numerals ๕๕
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## Translation

How do you say 55 in 38 different languages?
 Arabic خمسة و خمسون Croatian pedeset i pet Czech padesát pět Danish fem og halvtreds Dutch vijfenvijftig Estonian blaatɔ̃ vɔ atɔ̃ Faroese fimmti­fimm Filipino limáng pû’t limá Finnish viisi­kymmentä­viisi French cinquante-cinq Greek πενήντα πέντε German fünf­und­fünfzig Hebrew חמישים וחמש Hindi पचपन Hungarian ötven­öt Icelandic fimmtíu og fimm Indonesian lima puluh lima Italian cinquantacinque Japanese 五十五 Korean 오십오 Latvian piecdesmit pieci Lithuanian penkiasdešimt penki Norwegian femti­fem Persian پنجاه و پنج Polish pięćdziesiąt pięć Portuguese cinquenta e cinco Romanian cincizeci şi cinci Russian пятьдесят пять Serbian педесет и пет Slovak päťdesiat­päť Slovene petdeset pet Spanish cincuenta y cinco Swahili hamsini na tano Swedish femtiofem Thai ห้า​สิบ​ห้า Turkish elli beş Ukrainian пʼятдесят пʼять Vietnamese năm mươi lăm
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## Miscellaneous

 Number 55 reversed 55 ASCII Code 55 7 Unicode Character U+0037 7 Unix Timestamp Thu, 01 Jan 1970 00:00:55 +0000
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