56691767997 has 64 divisors (see below), whose sum is σ = 90125568000. Its totient is φ = 35114580864.

The previous prime is 56691767989. The next prime is 56691767999. The reversal of 56691767997 is 79976719665.

It is not a de Polignac number, because 56691767997 - 2³ = 56691767989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56691767999) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8004904 + ... + 8011982.

It is an arithmetic number, because the mean of its divisors is an integer number (1408212000).

Almost surely, 2^56691767997 is an apocalyptic number.

56691767997 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

It is an amenable number.

56691767997 is a deficient number, since it is larger than the sum of its proper divisors (33433800003).

56691767997 is a wasteful number, since it uses less digits than its factorization.

56691767997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7407 (or 7401 counting only the distinct ones).

The product of its digits is 270050760, while the sum is 72.

The spelling of 56691767997 in words is "fifty-six billion, six hundred ninety-one million, seven hundred sixty-seven thousand, nine hundred ninety-seven".