31166673557 has 2 divisors, whose sum is σ = 31166673558. Its totient is φ = 31166673556.

The previous prime is 31166673533. The next prime is 31166673583. The reversal of 31166673557 is 75537666113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25649303716 + 5517369841 = 160154^2 + 74279^2 .

It is a cyclic number.

It is not a de Polignac number, because 31166673557 - 2⁸ = 31166673301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31166673757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15583336778 + 15583336779.

It is an arithmetic number, because the mean of its divisors is an integer number (15583336779).

Almost surely, 2^31166673557 is an apocalyptic number.

It is an amenable number.

31166673557 is a deficient number, since it is larger than the sum of its proper divisors (1).

31166673557 is an equidigital number, since it uses as much as digits as its factorization.

31166673557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2381400, while the sum is 50.

The spelling of 31166673557 in words is "thirty-one billion, one hundred sixty-six million, six hundred seventy-three thousand, five hundred fifty-seven".