18666664 has 32 divisors (see below), whose sum is σ = 37072800. Its totient is φ = 8786880.

The previous prime is 18666647. The next prime is 18666667. The reversal of 18666664 is 46666681.

It is a self number, because there is not a number n which added to its sum of digits gives 18666664.

It is not an unprimeable number, because it can be changed into a prime (18666667) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 34234 + ... + 34774.

It is an arithmetic number, because the mean of its divisors is an integer number (1158525).

Almost surely, 2^18666664 is an apocalyptic number.

It is an amenable number.

18666664 is a deficient number, since it is larger than the sum of its proper divisors (18406136).

18666664 is a wasteful number, since it uses less digits than its factorization.

18666664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793 (or 789 counting only the distinct ones).

The product of its digits is 248832, while the sum is 43.

The square root of 18666664 is about 4320.4934903319. The cubic root of 18666664 is about 265.2704678945.

The spelling of 18666664 in words is "eighteen million, six hundred sixty-six thousand, six hundred sixty-four".