18516668 has 6 divisors (see below), whose sum is σ = 32404176. Its totient is φ = 9258332.

The previous prime is 18516647. The next prime is 18516713. The reversal of 18516668 is 86661581.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2314580 + ... + 2314587.

It is an arithmetic number, because the mean of its divisors is an integer number (5400696).

Almost surely, 2^18516668 is an apocalyptic number.

It is an amenable number.

18516668 is a deficient number, since it is larger than the sum of its proper divisors (13887508).

18516668 is a wasteful number, since it uses less digits than its factorization.

18516668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4629171 (or 4629169 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 18516668 is about 4303.0998129256. The cubic root of 18516668 is about 264.5580291560.

The spelling of 18516668 in words is "eighteen million, five hundred sixteen thousand, six hundred sixty-eight".