56644131657 has 16 divisors (see below), whose sum is σ = 76903490048. Its totient is φ = 37078404480.

The previous prime is 56644131629. The next prime is 56644131707. The reversal of 56644131657 is 75613144665.

It is not a de Polignac number, because 56644131657 - 2²² = 56639937353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56644131757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 531094 + ... + 628767.

It is an arithmetic number, because the mean of its divisors is an integer number (4806468128).

Almost surely, 2^56644131657 is an apocalyptic number.

It is an amenable number.

56644131657 is a deficient number, since it is larger than the sum of its proper divisors (20259358391).

56644131657 is a wasteful number, since it uses less digits than its factorization.

56644131657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160160.

The product of its digits is 1814400, while the sum is 48.

The spelling of 56644131657 in words is "fifty-six billion, six hundred forty-four million, one hundred thirty-one thousand, six hundred fifty-seven".