18663663 has 8 divisors (see below), whose sum is σ = 25038208. Its totient is φ = 12365784.

The previous prime is 18663661. The next prime is 18663683. The reversal of 18663663 is 36636681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18663663 - 2¹ = 18663661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18663661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18595 + ... + 19572.

It is an arithmetic number, because the mean of its divisors is an integer number (3129776).

Almost surely, 2^18663663 is an apocalyptic number.

18663663 is a deficient number, since it is larger than the sum of its proper divisors (6374545).

18663663 is a wasteful number, since it uses less digits than its factorization.

18663663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38333.

The product of its digits is 93312, while the sum is 39.

The square root of 18663663 is about 4320.1461780824. The cubic root of 18663663 is about 265.2562514757.

The spelling of 18663663 in words is "eighteen million, six hundred sixty-three thousand, six hundred sixty-three".