56565621621 has 8 divisors (see below), whose sum is σ = 83800920960. Its totient is φ = 37710414396.

The previous prime is 56565621589. The next prime is 56565621641. The reversal of 56565621621 is 12612656565.

56565621621 is a `hidden beast` number, since 5 + 6 + 56 + 562 + 16 + 21 = 666.

It is not a de Polignac number, because 56565621621 - 2⁵ = 56565621589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56565621641) 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, 1047511485 + ... + 1047511538.

It is an arithmetic number, because the mean of its divisors is an integer number (10475115120).

Almost surely, 2^56565621621 is an apocalyptic number.

It is an amenable number.

56565621621 is a deficient number, since it is larger than the sum of its proper divisors (27235299339).

56565621621 is a wasteful number, since it uses less digits than its factorization.

56565621621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095023032 (or 2095023026 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The spelling of 56565621621 in words is "fifty-six billion, five hundred sixty-five million, six hundred twenty-one thousand, six hundred twenty-one".