18668164 has 6 divisors (see below), whose sum is σ = 32669294. Its totient is φ = 9334080.

The previous prime is 18668123. The next prime is 18668179. The reversal of 18668164 is 46186681.

It can be written as a sum of positive squares in only one way, i.e., 14002564 + 4665600 = 3742^2 + 2160^2 .

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 as a sum of consecutive naturals, namely, 2333517 + ... + 2333524.

Almost surely, 2^18668164 is an apocalyptic number.

It is an amenable number.

18668164 is a deficient number, since it is larger than the sum of its proper divisors (14001130).

18668164 is a wasteful number, since it uses less digits than its factorization.

18668164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4667045 (or 4667043 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 18668164 is about 4320.6670781258. The cubic root of 18668164 is about 265.2775731642.

The spelling of 18668164 in words is "eighteen million, six hundred sixty-eight thousand, one hundred sixty-four".