18915113388 has 48 divisors (see below), whose sum is σ = 45790424064. Its totient is φ = 6070653120.

The previous prime is 18915113341. The next prime is 18915113411. The reversal of 18915113388 is 88331151981.

It is a happy number.

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, 55770 + ... + 202337.

It is an arithmetic number, because the mean of its divisors is an integer number (953967168).

Almost surely, 2^18915113388 is an apocalyptic number.

It is an amenable number.

18915113388 is an abundant number, since it is smaller than the sum of its proper divisors (26875310676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18915113388 is a wasteful number, since it uses less digits than its factorization.

18915113388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258342 (or 258340 counting only the distinct ones).

The product of its digits is 207360, while the sum is 48.

The spelling of 18915113388 in words is "eighteen billion, nine hundred fifteen million, one hundred thirteen thousand, three hundred eighty-eight".