18808663 has 2 divisors, whose sum is σ = 18808664. Its totient is φ = 18808662.

The previous prime is 18808639. The next prime is 18808667. The reversal of 18808663 is 36680881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18808663 - 2⁹ = 18808151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18808667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9404331 + 9404332.

It is an arithmetic number, because the mean of its divisors is an integer number (9404332).

Almost surely, 2^18808663 is an apocalyptic number.

18808663 is a deficient number, since it is larger than the sum of its proper divisors (1).

18808663 is an equidigital number, since it uses as much as digits as its factorization.

18808663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 18808663 is about 4336.8955486615. The cubic root of 18808663 is about 265.9414149156.

The spelling of 18808663 in words is "eighteen million, eight hundred eight thousand, six hundred sixty-three".