18569979388 has 6 divisors (see below), whose sum is σ = 32497463936. Its totient is φ = 9284989692.

The previous prime is 18569979371. The next prime is 18569979397. The reversal of 18569979388 is 88397996581.

It is a self number, because there is not a number n which added to its sum of digits gives 18569979388.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2321247420 + ... + 2321247427.

Almost surely, 2^18569979388 is an apocalyptic number.

It is an amenable number.

18569979388 is a deficient number, since it is larger than the sum of its proper divisors (13927484548).

18569979388 is a wasteful number, since it uses less digits than its factorization.

18569979388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4642494851 (or 4642494849 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 73.

The spelling of 18569979388 in words is "eighteen billion, five hundred sixty-nine million, nine hundred seventy-nine thousand, three hundred eighty-eight".