256789566552 has 64 divisors (see below), whose sum is σ = 645098688000. Its totient is φ = 85180310784.

The previous prime is 256789566529. The next prime is 256789566571. The reversal of 256789566552 is 255665987652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10495149 + ... + 10519587.

It is an arithmetic number, because the mean of its divisors is an integer number (10079667000).

Almost surely, 2^256789566552 is an apocalyptic number.

It is an amenable number.

256789566552 is an abundant number, since it is smaller than the sum of its proper divisors (388309121448).

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

256789566552 is a wasteful number, since it uses less digits than its factorization.

256789566552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26560 (or 26556 counting only the distinct ones).

The product of its digits is 272160000, while the sum is 66.

The spelling of 256789566552 in words is "two hundred fifty-six billion, seven hundred eighty-nine million, five hundred sixty-six thousand, five hundred fifty-two".