256621012371620 has 96 divisors (see below), whose sum is σ = 580571481208320. Its totient is φ = 94717573839360.

The previous prime is 256621012371611. The next prime is 256621012371751. The reversal of 256621012371620 is 26173210126652.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12823987415 + ... + 12824007425.

It is an arithmetic number, because the mean of its divisors is an integer number (6047619595920).

Almost surely, 2^{256621012371620} is an apocalyptic number.

256621012371620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256621012371620 is an abundant number, since it is smaller than the sum of its proper divisors (323950468836700).

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

256621012371620 is a wasteful number, since it uses less digits than its factorization.

256621012371620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35685 (or 35683 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 256621012371620 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, twelve million, three hundred seventy-one thousand, six hundred twenty".