656537888735656 has 16 divisors (see below), whose sum is σ = 1231746113927700. Its totient is φ = 328072258354944.

The previous prime is 656537888735591. The next prime is 656537888735681.

656537888735656 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 656503999607556 + 33889128100 = 25622334^2 + 184090^2 .

It is a super-2 number, since 2×656537888735656² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24585737425 + ... + 24585764128.

Almost surely, 2^{656537888735656} is an apocalyptic number.

It is an amenable number.

656537888735656 is a deficient number, since it is larger than the sum of its proper divisors (575208225192044).

656537888735656 is a wasteful number, since it uses less digits than its factorization.

656537888735656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49171503228 (or 49171503224 counting only the distinct ones).

The product of its digits is 182891520000, while the sum is 88.

The spelling of 656537888735656 in words is "six hundred fifty-six trillion, five hundred thirty-seven billion, eight hundred eighty-eight million, seven hundred thirty-five thousand, six hundred fifty-six".