56560651621 has 2 divisors, whose sum is σ = 56560651622. Its totient is φ = 56560651620.

The previous prime is 56560651591. The next prime is 56560651627. The reversal of 56560651621 is 12615606565.

56560651621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50146884225 + 6413767396 = 223935^2 + 80086^2 .

It is a cyclic number.

It is not a de Polignac number, because 56560651621 - 2³⁵ = 22200913253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56560651627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28280325810 + 28280325811.

It is an arithmetic number, because the mean of its divisors is an integer number (28280325811).

Almost surely, 2^56560651621 is an apocalyptic number.

It is an amenable number.

56560651621 is a deficient number, since it is larger than the sum of its proper divisors (1).

56560651621 is an equidigital number, since it uses as much as digits as its factorization.

56560651621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 56560651621 in words is "fifty-six billion, five hundred sixty million, six hundred fifty-one thousand, six hundred twenty-one".