256643676084 has 24 divisors (see below), whose sum is σ = 601112191680. Its totient is φ = 85222613824.

The previous prime is 256643676067. The next prime is 256643676139. The reversal of 256643676084 is 480676346652.

It is a super-2 number, since 2×256643676084² (a number of 24 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

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, 40656489 + ... + 40662800.

It is an arithmetic number, because the mean of its divisors is an integer number (25046341320).

Almost surely, 2^256643676084 is an apocalyptic number.

It is an amenable number.

256643676084 is an abundant number, since it is smaller than the sum of its proper divisors (344468515596).

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

256643676084 is a wasteful number, since it uses less digits than its factorization.

256643676084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81319559 (or 81319557 counting only the distinct ones).

The product of its (nonzero) digits is 34836480, while the sum is 57.

The spelling of 256643676084 in words is "two hundred fifty-six billion, six hundred forty-three million, six hundred seventy-six thousand, eighty-four".