18166664 has 16 divisors (see below), whose sum is σ = 34143900. Its totient is φ = 9061632.

The previous prime is 18166663. The next prime is 18166669. The reversal of 18166664 is 46666181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18130564 + 36100 = 4258^2 + 190^2 .

It is not an unprimeable number, because it can be changed into a prime (18166661) 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, 1172 + ... + 6140.

Almost surely, 2^18166664 is an apocalyptic number.

It is an amenable number.

18166664 is a deficient number, since it is larger than the sum of its proper divisors (15977236).

18166664 is a wasteful number, since it uses less digits than its factorization.

18166664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5432 (or 5428 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 18166664 is about 4262.2369713567. The cubic root of 18166664 is about 262.8805136075.

The spelling of 18166664 in words is "eighteen million, one hundred sixty-six thousand, six hundred sixty-four".