256621061364504 has 16 divisors (see below), whose sum is σ = 641552653411320. Its totient is φ = 85540353788160.

The previous prime is 256621061364449. The next prime is 256621061364523. The reversal of 256621061364504 is 405463160126652.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

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, 5346272111737 + ... + 5346272111784.

Almost surely, 2^{256621061364504} is an apocalyptic number.

256621061364504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

256621061364504 is an abundant number, since it is smaller than the sum of its proper divisors (384931592046816).

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

256621061364504 is a wasteful number, since it uses less digits than its factorization.

256621061364504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10692544223530 (or 10692544223526 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 51.

The spelling of 256621061364504 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, sixty-one million, three hundred sixty-four thousand, five hundred four".