56501515566 has 24 divisors (see below), whose sum is σ = 122429931624. Its totient is φ = 18832302960.

The previous prime is 56501515531. The next prime is 56501515583. The reversal of 56501515566 is 66551510565.

56501515566 is a `hidden beast` number, since 5 + 65 + 0 + 15 + 15 + 566 = 666.

56501515566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×56501515566² (a number of 22 digits) contains 22 as substring.

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, 111001 + ... + 354011.

It is an arithmetic number, because the mean of its divisors is an integer number (5101247151).

Almost surely, 2^56501515566 is an apocalyptic number.

56501515566 is an abundant number, since it is smaller than the sum of its proper divisors (65928416058).

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

56501515566 is a wasteful number, since it uses less digits than its factorization.

56501515566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255936 (or 255933 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 56501515566 in words is "fifty-six billion, five hundred one million, five hundred fifteen thousand, five hundred sixty-six".