18669668 has 6 divisors (see below), whose sum is σ = 32671926. Its totient is φ = 9334832.

The previous prime is 18669653. The next prime is 18669671. The reversal of 18669668 is 86696681.

It can be written as a sum of positive squares in only one way, i.e., 10705984 + 7963684 = 3272^2 + 2822^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2333705 + ... + 2333712.

It is an arithmetic number, because the mean of its divisors is an integer number (5445321).

Almost surely, 2^18669668 is an apocalyptic number.

It is an amenable number.

18669668 is a deficient number, since it is larger than the sum of its proper divisors (14002258).

18669668 is a wasteful number, since it uses less digits than its factorization.

18669668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4667421 (or 4667419 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The square root of 18669668 is about 4320.8411218188. The cubic root of 18669668 is about 265.2846969991.

The spelling of 18669668 in words is "eighteen million, six hundred sixty-nine thousand, six hundred sixty-eight".