18115187904 has 168 divisors, whose sum is σ = 57362872320. Its totient is φ = 5419814400.

The previous prime is 18115187843. The next prime is 18115187911. The reversal of 18115187904 is 40978151181.

It is a self number, because there is not a number n which added to its sum of digits gives 18115187904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 482449 + ... + 518639.

Almost surely, 2^18115187904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18115187904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28681436160).

18115187904 is an abundant number, since it is smaller than the sum of its proper divisors (39247684416).

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

18115187904 is a wasteful number, since it uses less digits than its factorization.

18115187904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36299 (or 36286 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 45.

The spelling of 18115187904 in words is "eighteen billion, one hundred fifteen million, one hundred eighty-seven thousand, nine hundred four".