56631613665 has 24 divisors (see below), whose sum is σ = 99596758464. Its totient is φ = 27457751200.

The previous prime is 56631613609. The next prime is 56631613673.

56631613665 is nontrivially palindromic in base 10.

56631613665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56631613665 - 2⁹ = 56631613153 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15599181 + ... + 15602810.

It is an arithmetic number, because the mean of its divisors is an integer number (4149864936).

Almost surely, 2^56631613665 is an apocalyptic number.

56631613665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

56631613665 is a deficient number, since it is larger than the sum of its proper divisors (42965144799).

56631613665 is a wasteful number, since it uses less digits than its factorization.

56631613665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31202021 (or 31202010 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 48.

The spelling of 56631613665 in words is "fifty-six billion, six hundred thirty-one million, six hundred thirteen thousand, six hundred sixty-five".