166235451631 has 2 divisors, whose sum is σ = 166235451632. Its totient is φ = 166235451630.

The previous prime is 166235451601. The next prime is 166235451653. The reversal of 166235451631 is 136154532661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166235451631 - 2¹⁵ = 166235418863 is a prime.

It is a super-2 number, since 2×166235451631² (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 (166235451601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83117725815 + 83117725816.

It is an arithmetic number, because the mean of its divisors is an integer number (83117725816).

Almost surely, 2^166235451631 is an apocalyptic number.

166235451631 is a deficient number, since it is larger than the sum of its proper divisors (1).

166235451631 is an equidigital number, since it uses as much as digits as its factorization.

166235451631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 43.

The spelling of 166235451631 in words is "one hundred sixty-six billion, two hundred thirty-five million, four hundred fifty-one thousand, six hundred thirty-one".