64656157 has 4 divisors (see below), whose sum is σ = 65716156. Its totient is φ = 63596160.

The previous prime is 64656149. The next prime is 64656169. The reversal of 64656157 is 75165646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6728836 + 57927321 = 2594^2 + 7611^2 .

It is not a de Polignac number, because 64656157 - 2³ = 64656149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64656187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529908 + ... + 530029.

It is an arithmetic number, because the mean of its divisors is an integer number (16429039).

Almost surely, 2^64656157 is an apocalyptic number.

It is an amenable number.

64656157 is a deficient number, since it is larger than the sum of its proper divisors (1059999).

64656157 is a wasteful number, since it uses less digits than its factorization.

64656157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059998.

The product of its digits is 151200, while the sum is 40.

The square root of 64656157 is about 8040.9052351088. The cubic root of 64656157 is about 401.3623484987.

The spelling of 64656157 in words is "sixty-four million, six hundred fifty-six thousand, one hundred fifty-seven".