## The number 65

Numeral systems

Binary: 1000001

Septimal (base 7): 122

Octal: 101

Hexadecimal: 41

Base 24: 2H

Factorization

65 = 5 × 13

65 has 4 divisors: 1, 5, 13, 65

Sum of all divisors other than 65:

19
Sums & differences

Sum of 2 squares: 65 = 7^{2} + 4^{2}

Difference of 2 squares: 65 = 9^{2} - 4^{2} = 33^{2} - 32^{2}

Characteristics

65 is a octogonal number

65 is a palindromic number in binary system (1000001)

Related primes

The 65th prime number is:

313Previous prime number:

61 — Next prime number:

67