256634907057564 has 24 divisors (see below), whose sum is σ = 684359752153728. Its totient is φ = 73324259159280.

The previous prime is 256634907057497. The next prime is 256634907057701. The reversal of 256634907057564 is 465750709436652.

It is a super-2 number, since 2×256634907057564² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1527588732402 + ... + 1527588732569.

It is an arithmetic number, because the mean of its divisors is an integer number (28514989673072).

Almost surely, 2^{256634907057564} is an apocalyptic number.

It is an amenable number.

256634907057564 is an abundant number, since it is smaller than the sum of its proper divisors (427724845096164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256634907057564 is a wasteful number, since it uses less digits than its factorization.

256634907057564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3055177464985 (or 3055177464983 counting only the distinct ones).

The product of its (nonzero) digits is 1143072000, while the sum is 69.

The spelling of 256634907057564 in words is "two hundred fifty-six trillion, six hundred thirty-four billion, nine hundred seven million, fifty-seven thousand, five hundred sixty-four".