18556668 has 48 divisors (see below), whose sum is σ = 51814560. Its totient is φ = 5709312.

The previous prime is 18556649. The next prime is 18556669. The reversal of 18556668 is 86665581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18556669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5205 + ... + 8012.

It is an arithmetic number, because the mean of its divisors is an integer number (1079470).

Almost surely, 2^18556668 is an apocalyptic number.

18556668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18556668 is an abundant number, since it is smaller than the sum of its proper divisors (33257892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18556668 is a wasteful number, since it uses less digits than its factorization.

18556668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13243 (or 13235 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 18556668 is about 4307.7451178082. The cubic root of 18556668 is about 264.7483929635.

The spelling of 18556668 in words is "eighteen million, five hundred fifty-six thousand, six hundred sixty-eight".