56717665571 has 12 divisors (see below), whose sum is σ = 65982081888. Its totient is φ = 48611907792.

The previous prime is 56717665553. The next prime is 56717665619. The reversal of 56717665571 is 17556671765.

It is not a de Polignac number, because 56717665571 - 2¹⁸ = 56717403427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56717665531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 975110 + ... + 1031636.

It is an arithmetic number, because the mean of its divisors is an integer number (5498506824).

Almost surely, 2^56717665571 is an apocalyptic number.

56717665571 is a deficient number, since it is larger than the sum of its proper divisors (9264416317).

56717665571 is a wasteful number, since it uses less digits than its factorization.

56717665571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77018 (or 77011 counting only the distinct ones).

The product of its digits is 9261000, while the sum is 56.

The spelling of 56717665571 in words is "fifty-six billion, seven hundred seventeen million, six hundred sixty-five thousand, five hundred seventy-one".