56505016566 has 24 divisors (see below), whose sum is σ = 122510259144. Its totient is φ = 18822278880.

The previous prime is 56505016507. The next prime is 56505016571. The reversal of 56505016566 is 66561050565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1033156 + ... + 1086471.

It is an arithmetic number, because the mean of its divisors is an integer number (5104594131).

Almost surely, 2^56505016566 is an apocalyptic number.

56505016566 is an abundant number, since it is smaller than the sum of its proper divisors (66005242578).

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

56505016566 is a wasteful number, since it uses less digits than its factorization.

56505016566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121116 (or 2121113 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 56505016566 in words is "fifty-six billion, five hundred five million, sixteen thousand, five hundred sixty-six".