256621604721104 has 40 divisors (see below), whose sum is σ = 568256359056960. Its totient is φ = 109976273722368.

The previous prime is 256621604721061. The next prime is 256621604721161. The reversal of 256621604721104 is 401127406126652.

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, 43175489 + ... + 48758240.

It is an arithmetic number, because the mean of its divisors is an integer number (14206408976424).

Almost surely, 2^{256621604721104} is an apocalyptic number.

It is an amenable number.

256621604721104 is an abundant number, since it is smaller than the sum of its proper divisors (311634754335856).

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

256621604721104 is a wasteful number, since it uses less digits than its factorization.

256621604721104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91958667 (or 91958661 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 256621604721104 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, six hundred four million, seven hundred twenty-one thousand, one hundred four".