The Natural Number 55

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Properties of the Number 55

  • Because 55 is not divisible by 2 ...
    • 55 is an odd number
    • 55 has parity 1
    • 55 is not an even number
  • Because 55 can be factored as 5 x 11 ...
    • 55 is a composite number
    • 55 is not a prime number

Alternative Representations of the Number 55

  • Base 2 (binary): 110111
  • Base 8 (octal): 67
  • Base 16 (hexadecimal): 37
  • Roman numeral: LV
  • Words: fifty-five

Divisors of the Number 55

  • 55 has 4 positive divisors: 1, 5, 11, 55
    • The sum of the positive divisors is 72
  • 55 has 3 proper divisors: 1, 5, 11
    • The sum of the proper divisors is 17
  • 55 is a deficient number since the sum of the proper divisors is less than 55
  • 55 is not a perfect number
  • 55 is not an abundant number

More Properties of the Number 55

  • 55 is not a square number
  • 55 is not a cube number
  • 55 is a palindromic number (i.e., the digits are the same forwards and backwards)
  • 55 is a Fibonacci number
  • 55 is not a Lucas number

11:15 pm, Saturday, April 29, 2017 (UTC; +0000)
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