18159899880 has 32 divisors (see below), whose sum is σ = 54479700000. Its totient is φ = 4842639936.

The previous prime is 18159899869. The next prime is 18159899881. The reversal of 18159899880 is 8899895181.

It is not an unprimeable number, because it can be changed into a prime (18159899881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75666130 + ... + 75666369.

It is an arithmetic number, because the mean of its divisors is an integer number (1702490625).

Almost surely, 2^18159899880 is an apocalyptic number.

18159899880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18159899880 is an abundant number, since it is smaller than the sum of its proper divisors (36319800120).

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

18159899880 is a wasteful number, since it uses less digits than its factorization.

18159899880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151332513 (or 151332509 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 66.

The spelling of 18159899880 in words is "eighteen billion, one hundred fifty-nine million, eight hundred ninety-nine thousand, eight hundred eighty".