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

Properties of the number 55

Number of digits2
Sum of digits10
Product of digits25
Number parityOdd
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Prime Factorization of 55

Prime factorization5 x 11
Prime factors5, 11
Number of distinct prime factors ω(n)2
Total number of prime factors Ω(n)2
Sum of prime factors16
Product of prime factors55
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Divisors of 55

List of proper divisors 1, 5, 11
List of all dividers1, 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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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.
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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 557.4161984870957
Natural Logarithm (ln) of 554.0073331852325
Decimal Logarithm (log) of 551.7403626894942
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Trigonometry is the study of the relationship between the angles and sides of a triangle.
Sine of 55-0.99975517335862
Cosecant of 55-1.0002448865961
Cosine of 550.022126756261956
Secant of 5545.194152643123
Tangent of 55-45.183087910521
Cotangent of 55-0.02213217480798
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Number parity

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

Is 55 an Even Number?


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 numerals৫৫
Eastern Arabic numerals٥٥
Hieroglyphs numeralsused in Ancient Egypt𓎊𓏾
Khmer numerals៥៥
Japanese numerals五十五
Roman numeralsLV
Thai numerals๕๕
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How do you say 55 in 38 different languages?
Arabicخمسة و خمسون
Croatianpedeset i pet
Czechpadesát pět
Danish fem og halvtreds
Estonianblaatɔ̃ vɔ atɔ̃
Filipinolimáng pû’t limá
Greekπενήντα πέντε
Hebrewחמישים וחמש
Icelandicfimmtíu og fimm
Indonesianlima puluh lima
Latvianpiecdesmit pieci
Lithuanianpenkiasdešimt penki
Persianپنجاه و پنج
Polishpięćdziesiąt pięć
Portuguesecinquenta e cinco
Romaniancincizeci şi cinci
Russianпятьдесят пять
Serbianпедесет и пет
Slovenepetdeset pet
Spanish cincuenta y cinco
Swahilihamsini na tano
Turkishelli beş
Ukrainianпʼятдесят пʼять
Vietnamesenăm mươi lăm
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Number 55 reversed55
ASCII Code557
Unicode CharacterU+00377
Unix TimestampThu, 01 Jan 1970 00:00:55 +0000
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