56577220397 has 2 divisors, whose sum is σ = 56577220398. Its totient is φ = 56577220396.

The previous prime is 56577220391. The next prime is 56577220423. The reversal of 56577220397 is 79302277565.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43058740036 + 13518480361 = 207506^2 + 116269^2 .

It is a cyclic number.

It is not a de Polignac number, because 56577220397 - 2⁶ = 56577220333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56577220391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28288610198 + 28288610199.

It is an arithmetic number, because the mean of its divisors is an integer number (28288610199).

Almost surely, 2^56577220397 is an apocalyptic number.

It is an amenable number.

56577220397 is a deficient number, since it is larger than the sum of its proper divisors (1).

56577220397 is an equidigital number, since it uses as much as digits as its factorization.

56577220397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5556600, while the sum is 53.

The spelling of 56577220397 in words is "fifty-six billion, five hundred seventy-seven million, two hundred twenty thousand, three hundred ninety-seven".