18663554905 has 16 divisors (see below), whose sum is σ = 22511623680. Its totient is φ = 14854099392.

The previous prime is 18663554893. The next prime is 18663554933. The reversal of 18663554905 is 50945536681.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18663554905 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 968272 + ... + 987358.

It is an arithmetic number, because the mean of its divisors is an integer number (1406976480).

Almost surely, 2^18663554905 is an apocalyptic number.

It is an amenable number.

18663554905 is a deficient number, since it is larger than the sum of its proper divisors (3848068775).

18663554905 is a wasteful number, since it uses less digits than its factorization.

18663554905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20088.

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 18663554905 in words is "eighteen billion, six hundred sixty-three million, five hundred fifty-four thousand, nine hundred five".