256621604372367 has 32 divisors (see below), whose sum is σ = 383771443991040. Its totient is φ = 151488727770240.

The previous prime is 256621604372359. The next prime is 256621604372377. The reversal of 256621604372367 is 763273406126652.

It is not a de Polignac number, because 256621604372367 - 2³ = 256621604372359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256621604372367.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256621604372317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1252284517 + ... + 1252489422.

It is an arithmetic number, because the mean of its divisors is an integer number (11992857624720).

Almost surely, 2^{256621604372367} is an apocalyptic number.

256621604372367 is a deficient number, since it is larger than the sum of its proper divisors (127149839618673).

256621604372367 is a wasteful number, since it uses less digits than its factorization.

256621604372367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2504774063.

The product of its (nonzero) digits is 91445760, while the sum is 60.

The spelling of 256621604372367 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, six hundred four million, three hundred seventy-two thousand, three hundred sixty-seven".