18199801992 has 16 divisors (see below), whose sum is σ = 45499505040. Its totient is φ = 6066600656.

The previous prime is 18199801913. The next prime is 18199801993. The reversal of 18199801992 is 29910899181.

It is not an unprimeable number, because it can be changed into a prime (18199801993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379162518 + ... + 379162565.

It is an arithmetic number, because the mean of its divisors is an integer number (2843719065).

Almost surely, 2^18199801992 is an apocalyptic number.

18199801992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18199801992 is an abundant number, since it is smaller than the sum of its proper divisors (27299703048).

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

18199801992 is a wasteful number, since it uses less digits than its factorization.

18199801992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758325092 (or 758325088 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 57.

The spelling of 18199801992 in words is "eighteen billion, one hundred ninety-nine million, eight hundred one thousand, nine hundred ninety-two".