56997641677 has 2 divisors, whose sum is σ = 56997641678. Its totient is φ = 56997641676.

The previous prime is 56997641579. The next prime is 56997641681. The reversal of 56997641677 is 77614679965.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29563019721 + 27434621956 = 171939^2 + 165634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56997641677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56997621677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28498820838 + 28498820839.

It is an arithmetic number, because the mean of its divisors is an integer number (28498820839).

Almost surely, 2^56997641677 is an apocalyptic number.

It is an amenable number.

56997641677 is a deficient number, since it is larger than the sum of its proper divisors (1).

56997641677 is an equidigital number, since it uses as much as digits as its factorization.

56997641677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120022560, while the sum is 67.

The spelling of 56997641677 in words is "fifty-six billion, nine hundred ninety-seven million, six hundred forty-one thousand, six hundred seventy-seven".