18806661 has 20 divisors (see below), whose sum is σ = 28459200. Its totient is φ = 12374856.

The previous prime is 18806633. The next prime is 18806687. The reversal of 18806661 is 16660881.

It is not a de Polignac number, because 18806661 - 2⁵ = 18806629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18806611) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4930 + ... + 7868.

It is an arithmetic number, because the mean of its divisors is an integer number (1422960).

Almost surely, 2^18806661 is an apocalyptic number.

It is an amenable number.

18806661 is a deficient number, since it is larger than the sum of its proper divisors (9652539).

18806661 is an equidigital number, since it uses as much as digits as its factorization.

18806661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030 (or 3021 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18806661 is about 4336.6647322568. The cubic root of 18806661 is about 265.9319789515.

The spelling of 18806661 in words is "eighteen million, eight hundred six thousand, six hundred sixty-one".