56716721511 has 16 divisors (see below), whose sum is σ = 77518879200. Its totient is φ = 36864097280.

The previous prime is 56716721497. The next prime is 56716721531. The reversal of 56716721511 is 11512761765.

It is a cyclic number.

It is not a de Polignac number, because 56716721511 - 2³⁰ = 55642979687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56716721531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29215 + ... + 338063.

It is an arithmetic number, because the mean of its divisors is an integer number (4844929950).

Almost surely, 2^56716721511 is an apocalyptic number.

56716721511 is a deficient number, since it is larger than the sum of its proper divisors (20802157689).

56716721511 is a wasteful number, since it uses less digits than its factorization.

56716721511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310386.

The product of its digits is 88200, while the sum is 42.

The spelling of 56716721511 in words is "fifty-six billion, seven hundred sixteen million, seven hundred twenty-one thousand, five hundred eleven".