18668603 has 12 divisors (see below), whose sum is σ = 19716288. Its totient is φ = 17657520.

The previous prime is 18668599. The next prime is 18668641. The reversal of 18668603 is 30686681.

It is not a de Polignac number, because 18668603 - 2² = 18668599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18668693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107825 + ... + 107997.

It is an arithmetic number, because the mean of its divisors is an integer number (1643024).

Almost surely, 2^18668603 is an apocalyptic number.

18668603 is a deficient number, since it is larger than the sum of its proper divisors (1047685).

18668603 is an equidigital number, since it uses as much as digits as its factorization.

18668603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 263 counting only the distinct ones).

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

The square root of 18668603 is about 4320.7178801676. The cubic root of 18668603 is about 265.2796525677.

The spelling of 18668603 in words is "eighteen million, six hundred sixty-eight thousand, six hundred three".