18389974868 has 24 divisors (see below), whose sum is σ = 32894467200. Its totient is φ = 8993731968.

The previous prime is 18389974751. The next prime is 18389974871. The reversal of 18389974868 is 86847998381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238133 + ... + 305756.

It is an arithmetic number, because the mean of its divisors is an integer number (1370602800).

Almost surely, 2^18389974868 is an apocalyptic number.

It is an amenable number.

18389974868 is a deficient number, since it is larger than the sum of its proper divisors (14504492332).

18389974868 is a wasteful number, since it uses less digits than its factorization.

18389974868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544079 (or 544077 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 71.

The spelling of 18389974868 in words is "eighteen billion, three hundred eighty-nine million, nine hundred seventy-four thousand, eight hundred sixty-eight".