18166 has 8 divisors (see below), whose sum is σ = 28224. Its totient is φ = 8760.

The previous prime is 18149. The next prime is 18169. The reversal of 18166 is 66181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85 + ... + 208.

It is an arithmetic number, because the mean of its divisors is an integer number (3528).

2¹⁸¹⁶⁶ is an apocalyptic number.

18166 is a deficient number, since it is larger than the sum of its proper divisors (10058).

18166 is a wasteful number, since it uses less digits than its factorization.

18166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326.

The product of its digits is 288, while the sum is 22.

The square root of 18166 is about 134.7813043415. The cubic root of 18166 is about 26.2877310767.

The spelling of 18166 in words is "eighteen thousand, one hundred sixty-six".