256120634624 has 36 divisors (see below), whose sum is σ = 512379648900. Its totient is φ = 127775047680.

The previous prime is 256120634603. The next prime is 256120634681. The reversal of 256120634624 is 426436021652.

It can be written as a sum of positive squares in 2 ways, for example, as 49248486400 + 206872148224 = 221920^2 + 454832^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999167 + ... + 1229054.

It is an arithmetic number, because the mean of its divisors is an integer number (14232768025).

Almost surely, 2^256120634624 is an apocalyptic number.

It is an amenable number.

256120634624 is an abundant number, since it is smaller than the sum of its proper divisors (256259014276).

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

256120634624 is an equidigital number, since it uses as much as digits as its factorization.

256120634624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228686 (or 2228672 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 256120634624 in words is "two hundred fifty-six billion, one hundred twenty million, six hundred thirty-four thousand, six hundred twenty-four".