256626465264 has 120 divisors (see below), whose sum is σ = 773577779520. Its totient is φ = 78948297216.

The previous prime is 256626465229. The next prime is 256626465323. The reversal of 256626465264 is 462564626652.

256626465264 is a `hidden beast` number, since 2 + 5 + 6 + 626 + 4 + 6 + 5 + 2 + 6 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 256626465264.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18411642 + ... + 18425574.

It is an arithmetic number, because the mean of its divisors is an integer number (6446481496).

Almost surely, 2^256626465264 is an apocalyptic number.

256626465264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

256626465264 is an abundant number, since it is smaller than the sum of its proper divisors (516951314256).

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

256626465264 is a wasteful number, since it uses less digits than its factorization.

256626465264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23799 (or 23790 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 54.

The spelling of 256626465264 in words is "two hundred fifty-six billion, six hundred twenty-six million, four hundred sixty-five thousand, two hundred sixty-four".