18638506168 has 16 divisors (see below), whose sum is σ = 35059574160. Its totient is φ = 9289286400.

The previous prime is 18638506129. The next prime is 18638506169. The reversal of 18638506168 is 86160583681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18638506169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3743193 + ... + 3748168.

It is an arithmetic number, because the mean of its divisors is an integer number (2191223385).

Almost surely, 2^18638506168 is an apocalyptic number.

It is an amenable number.

18638506168 is a deficient number, since it is larger than the sum of its proper divisors (16421067992).

18638506168 is a wasteful number, since it uses less digits than its factorization.

18638506168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7491678 (or 7491674 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 18638506168 in words is "eighteen billion, six hundred thirty-eight million, five hundred six thousand, one hundred sixty-eight".