18005166 has 20 divisors (see below), whose sum is σ = 40345272. Its totient is φ = 6001668.

The previous prime is 18005161. The next prime is 18005177. The reversal of 18005166 is 66150081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18005161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 55410 + ... + 55733.

Almost surely, 2^18005166 is an apocalyptic number.

18005166 is an abundant number, since it is smaller than the sum of its proper divisors (22340106).

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

18005166 is a wasteful number, since it uses less digits than its factorization.

18005166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111157 (or 111148 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 18005166 is about 4243.2494623814. The cubic root of 18005166 is about 262.0992087821.

The spelling of 18005166 in words is "eighteen million, five thousand, one hundred sixty-six".