166166631 has 24 divisors (see below), whose sum is σ = 242838336. Its totient is φ = 109486080.

The previous prime is 166166617. The next prime is 166166641. The reversal of 166166631 is 136661661.

It is a happy number.

166166631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166166631 - 2⁵ = 166166599 is a prime.

It is a super-2 number, since 2×166166631² = 55222698515780322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166166641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 470551 + ... + 470903.

It is an arithmetic number, because the mean of its divisors is an integer number (10118264).

Almost surely, 2^166166631 is an apocalyptic number.

166166631 is a deficient number, since it is larger than the sum of its proper divisors (76671705).

166166631 is a wasteful number, since it uses less digits than its factorization.

166166631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823 (or 820 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 166166631 is about 12890.5636416722. The cubic root of 166166631 is about 549.7702963657.

The spelling of 166166631 in words is "one hundred sixty-six million, one hundred sixty-six thousand, six hundred thirty-one".