56577307155121 has 2 divisors, whose sum is σ = 56577307155122. Its totient is φ = 56577307155120.

The previous prime is 56577307155037. The next prime is 56577307155151. The reversal of 56577307155121 is 12155170377565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41780206265121 + 14797100890000 = 6463761^2 + 3846700^2 .

It is a cyclic number.

It is not a de Polignac number, because 56577307155121 - 2¹⁵ = 56577307122353 is a prime.

It is not a weakly prime, because it can be changed into another prime (56577307155151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28288653577560 + 28288653577561.

It is an arithmetic number, because the mean of its divisors is an integer number (28288653577561).

Almost surely, 2^{56577307155121} is an apocalyptic number.

It is an amenable number.

56577307155121 is a deficient number, since it is larger than the sum of its proper divisors (1).

56577307155121 is an equidigital number, since it uses as much as digits as its factorization.

56577307155121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7717500, while the sum is 55.

The spelling of 56577307155121 in words is "fifty-six trillion, five hundred seventy-seven billion, three hundred seven million, one hundred fifty-five thousand, one hundred twenty-one".