18317788388 has 48 divisors (see below), whose sum is σ = 34302610944. Its totient is φ = 8528709120.

The previous prime is 18317788361. The next prime is 18317788421. The reversal of 18317788388 is 88388771381.

It is a self number, because there is not a number n which added to its sum of digits gives 18317788388.

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, 10047245 + ... + 10049067.

It is an arithmetic number, because the mean of its divisors is an integer number (714637728).

Almost surely, 2^18317788388 is an apocalyptic number.

It is an amenable number.

18317788388 is a deficient number, since it is larger than the sum of its proper divisors (15984822556).

18317788388 is a wasteful number, since it uses less digits than its factorization.

18317788388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332 (or 3330 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 62.

The spelling of 18317788388 in words is "eighteen billion, three hundred seventeen million, seven hundred eighty-eight thousand, three hundred eighty-eight".