166317152431 has 2 divisors, whose sum is σ = 166317152432. Its totient is φ = 166317152430.

The previous prime is 166317152389. The next prime is 166317152447. The reversal of 166317152431 is 134251713661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166317152431 - 2⁷ = 166317152303 is a prime.

It is a super-2 number, since 2×166317152431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166317150431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83158576215 + 83158576216.

It is an arithmetic number, because the mean of its divisors is an integer number (83158576216).

Almost surely, 2^166317152431 is an apocalyptic number.

166317152431 is a deficient number, since it is larger than the sum of its proper divisors (1).

166317152431 is an equidigital number, since it uses as much as digits as its factorization.

166317152431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The spelling of 166317152431 in words is "one hundred sixty-six billion, three hundred seventeen million, one hundred fifty-two thousand, four hundred thirty-one".