18189914980 has 12 divisors (see below), whose sum is σ = 38198821500. Its totient is φ = 7275965984.

The previous prime is 18189914971. The next prime is 18189915011. The reversal of 18189914980 is 8941998181.

It can be written as a sum of positive squares in 2 ways, for example, as 11905864996 + 6284049984 = 109114^2 + 79272^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454747855 + ... + 454747894.

It is an arithmetic number, because the mean of its divisors is an integer number (3183235125).

Almost surely, 2^18189914980 is an apocalyptic number.

18189914980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18189914980 is an abundant number, since it is smaller than the sum of its proper divisors (20008906520).

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

18189914980 is a wasteful number, since it uses less digits than its factorization.

18189914980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909495758 (or 909495756 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 58.

The spelling of 18189914980 in words is "eighteen billion, one hundred eighty-nine million, nine hundred fourteen thousand, nine hundred eighty".