56071620716521 has 16 divisors (see below), whose sum is σ = 58245330286080. Its totient is φ = 53936793319680.

The previous prime is 56071620716509. The next prime is 56071620716533. The reversal of 56071620716521 is 12561702617065.

It is an interprime number because it is at equal distance from previous prime (56071620716509) and next prime (56071620716533).

It is a cyclic number.

It is not a de Polignac number, because 56071620716521 - 2³³ = 56063030781929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56071620716561) 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, 5949220 + ... + 12146458.

It is an arithmetic number, because the mean of its divisors is an integer number (3640333142880).

Almost surely, 2^{56071620716521} is an apocalyptic number.

It is an amenable number.

56071620716521 is a deficient number, since it is larger than the sum of its proper divisors (2173709569559).

56071620716521 is a wasteful number, since it uses less digits than its factorization.

56071620716521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6200376.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The spelling of 56071620716521 in words is "fifty-six trillion, seventy-one billion, six hundred twenty million, seven hundred sixteen thousand, five hundred twenty-one".