256638836652 has 48 divisors (see below), whose sum is σ = 691689704832. Its totient is φ = 73194676480.

The previous prime is 256638836617. The next prime is 256638836687.

256638836652 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (256638836617) and next prime (256638836687).

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, 57181098 + ... + 57185585.

It is an arithmetic number, because the mean of its divisors is an integer number (14410202184).

Almost surely, 2^256638836652 is an apocalyptic number.

256638836652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

256638836652 is an abundant number, since it is smaller than the sum of its proper divisors (435050868180).

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

256638836652 is a wasteful number, since it uses less digits than its factorization.

256638836652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114366718 (or 114366716 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 60.

The spelling of 256638836652 in words is "two hundred fifty-six billion, six hundred thirty-eight million, eight hundred thirty-six thousand, six hundred fifty-two".