31657064557 has 2 divisors, whose sum is σ = 31657064558. Its totient is φ = 31657064556.

The previous prime is 31657064519. The next prime is 31657064563. The reversal of 31657064557 is 75546075613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23098224361 + 8558840196 = 151981^2 + 92514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31657064557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31657064557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31657064597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15828532278 + 15828532279.

It is an arithmetic number, because the mean of its divisors is an integer number (15828532279).

Almost surely, 2^31657064557 is an apocalyptic number.

It is an amenable number.

31657064557 is a deficient number, since it is larger than the sum of its proper divisors (1).

31657064557 is an equidigital number, since it uses as much as digits as its factorization.

31657064557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646000, while the sum is 49.

The spelling of 31657064557 in words is "thirty-one billion, six hundred fifty-seven million, sixty-four thousand, five hundred fifty-seven".