256621051565372 has 24 divisors (see below), whose sum is σ = 483681591120000. Its totient is φ = 118428336115776.

The previous prime is 256621051565369. The next prime is 256621051565381. The reversal of 256621051565372 is 273565150126652.

It is a happy number.

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, 252596972 + ... + 253610867.

It is an arithmetic number, because the mean of its divisors is an integer number (20153399630000).

Almost surely, 2^{256621051565372} is an apocalyptic number.

It is an amenable number.

256621051565372 is a deficient number, since it is larger than the sum of its proper divisors (227060539554628).

256621051565372 is a wasteful number, since it uses less digits than its factorization.

256621051565372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506217605 (or 506217603 counting only the distinct ones).

The product of its (nonzero) digits is 22680000, while the sum is 56.

The spelling of 256621051565372 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, fifty-one million, five hundred sixty-five thousand, three hundred seventy-two".