18166223 has 8 divisors (see below), whose sum is σ = 19639920. Its totient is φ = 16744320.

The previous prime is 18166193. The next prime is 18166283. The reversal of 18166223 is 32266181.

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

It is not a de Polignac number, because 18166223 - 2⁸ = 18165967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18166283) 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 7 ways as a sum of consecutive naturals, for example, 12218 + ... + 13623.

It is an arithmetic number, because the mean of its divisors is an integer number (2454990).

Almost surely, 2^18166223 is an apocalyptic number.

18166223 is a deficient number, since it is larger than the sum of its proper divisors (1473697).

18166223 is a wasteful number, since it uses less digits than its factorization.

18166223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25897.

The product of its digits is 3456, while the sum is 29.

The square root of 18166223 is about 4262.1852376451. The cubic root of 18166223 is about 262.8783864284.

The spelling of 18166223 in words is "eighteen million, one hundred sixty-six thousand, two hundred twenty-three".