18166158 has 48 divisors (see below), whose sum is σ = 40772160. Its totient is φ = 5842368.

The previous prime is 18166117. The next prime is 18166171. The reversal of 18166158 is 85166181.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92116 + ... + 92312.

It is an arithmetic number, because the mean of its divisors is an integer number (849420).

Almost surely, 2^18166158 is an apocalyptic number.

18166158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18166158 is an abundant number, since it is smaller than the sum of its proper divisors (22606002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18166158 is a wasteful number, since it uses less digits than its factorization.

18166158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361 (or 358 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 18166158 is about 4262.1776124418. The cubic root of 18166158 is about 262.8780728957.

It can be divided in two parts, 18 and 166158, that added together give a triangular number (166176 = T₅₇₆).

The spelling of 18166158 in words is "eighteen million, one hundred sixty-six thousand, one hundred fifty-eight".