56566516655 has 16 divisors (see below), whose sum is σ = 74129809824. Its totient is φ = 41095342080.

The previous prime is 56566516639. The next prime is 56566516679. The reversal of 56566516655 is 55661566565.

It is not a de Polignac number, because 56566516655 - 2⁴ = 56566516639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56566516655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 497282 + ... + 600351.

It is an arithmetic number, because the mean of its divisors is an integer number (4633113114).

Almost surely, 2^56566516655 is an apocalyptic number.

56566516655 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

56566516655 is a deficient number, since it is larger than the sum of its proper divisors (17563293169).

56566516655 is a wasteful number, since it uses less digits than its factorization.

56566516655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098586.

The product of its digits is 24300000, while the sum is 56.

The spelling of 56566516655 in words is "fifty-six billion, five hundred sixty-six million, five hundred sixteen thousand, six hundred fifty-five".