56120720137 has 2 divisors, whose sum is σ = 56120720138. Its totient is φ = 56120720136.

The previous prime is 56120720111. The next prime is 56120720143. The reversal of 56120720137 is 73102702165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50922886921 + 5197833216 = 225661^2 + 72096^2 .

It is a cyclic number.

It is not a de Polignac number, because 56120720137 - 2²³ = 56112331529 is a prime.

It is not a weakly prime, because it can be changed into another prime (56120720167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28060360068 + 28060360069.

It is an arithmetic number, because the mean of its divisors is an integer number (28060360069).

Almost surely, 2^56120720137 is an apocalyptic number.

It is an amenable number.

56120720137 is a deficient number, since it is larger than the sum of its proper divisors (1).

56120720137 is an equidigital number, since it uses as much as digits as its factorization.

56120720137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 34.

The spelling of 56120720137 in words is "fifty-six billion, one hundred twenty million, seven hundred twenty thousand, one hundred thirty-seven".