56721000937 has 2 divisors, whose sum is σ = 56721000938. Its totient is φ = 56721000936.

The previous prime is 56721000911. The next prime is 56721000961. The reversal of 56721000937 is 73900012765.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48059162176 + 8661838761 = 219224^2 + 93069^2 .

It is a cyclic number.

It is not a de Polignac number, because 56721000937 - 2²³ = 56712612329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56721000937.

It is not a weakly prime, because it can be changed into another prime (56721000997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28360500468 + 28360500469.

It is an arithmetic number, because the mean of its divisors is an integer number (28360500469).

Almost surely, 2^56721000937 is an apocalyptic number.

It is an amenable number.

56721000937 is a deficient number, since it is larger than the sum of its proper divisors (1).

56721000937 is an equidigital number, since it uses as much as digits as its factorization.

56721000937 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 40.

The spelling of 56721000937 in words is "fifty-six billion, seven hundred twenty-one million, nine hundred thirty-seven", and thus it is an aban number.