18999323118 has 16 divisors (see below), whose sum is σ = 42220718160. Its totient is φ = 6333107688.

The previous prime is 18999323107. The next prime is 18999323137. The reversal of 18999323118 is 81132399981.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 351839317 = 18999323118 / (1 + 8 + 9 + 9 + 9 + 3 + 2 + 3 + 1 + 1 + 8).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 175919605 + ... + 175919712.

It is an arithmetic number, because the mean of its divisors is an integer number (2638794885).

Almost surely, 2^18999323118 is an apocalyptic number.

18999323118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18999323118 is an abundant number, since it is smaller than the sum of its proper divisors (23221395042).

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

18999323118 is a wasteful number, since it uses less digits than its factorization.

18999323118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351839328 (or 351839322 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The spelling of 18999323118 in words is "eighteen billion, nine hundred ninety-nine million, three hundred twenty-three thousand, one hundred eighteen".