256621007362616 has 32 divisors (see below), whose sum is σ = 518190295934640. Its totient is φ = 118437433659648.

The previous prime is 256621007362613. The next prime is 256621007362691. The reversal of 256621007362616 is 616263700126652.

It is a super-2 number, since 2×256621007362616² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256621007362613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27490166 + ... + 35622341.

Almost surely, 2^{256621007362616} is an apocalyptic number.

256621007362616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

256621007362616 is an abundant number, since it is smaller than the sum of its proper divisors (261569288572024).

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

256621007362616 is a wasteful number, since it uses less digits than its factorization.

256621007362616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63151623 (or 63151619 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 53.

The spelling of 256621007362616 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, seven million, three hundred sixty-two thousand, six hundred sixteen".