64656169 has 2 divisors, whose sum is σ = 64656170. Its totient is φ = 64656168.

The previous prime is 64656149. The next prime is 64656187. The reversal of 64656169 is 96165646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52490025 + 12166144 = 7245^2 + 3488^2 .

It is a cyclic number.

It is not a de Polignac number, because 64656169 - 2⁷ = 64656041 is a prime.

It is a super-2 number, since 2×64656169² = 8360840379513122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64656149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32328084 + 32328085.

It is an arithmetic number, because the mean of its divisors is an integer number (32328085).

Almost surely, 2^64656169 is an apocalyptic number.

It is an amenable number.

64656169 is a deficient number, since it is larger than the sum of its proper divisors (1).

64656169 is an equidigital number, since it uses as much as digits as its factorization.

64656169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The square root of 64656169 is about 8040.9059812934. The cubic root of 64656169 is about 401.3623733293.

The spelling of 64656169 in words is "sixty-four million, six hundred fifty-six thousand, one hundred sixty-nine".