18320989512 has 32 divisors (see below), whose sum is σ = 52345684800. Its totient is φ = 5234568384.

The previous prime is 18320989499. The next prime is 18320989513. The reversal of 18320989512 is 21598902381.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18320989513) 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, 54526587 + ... + 54526922.

It is an arithmetic number, because the mean of its divisors is an integer number (1635802650).

Almost surely, 2^18320989512 is an apocalyptic number.

18320989512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18320989512 is an abundant number, since it is smaller than the sum of its proper divisors (34024695288).

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

18320989512 is a wasteful number, since it uses less digits than its factorization.

18320989512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109053525 (or 109053521 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 48.

The spelling of 18320989512 in words is "eighteen billion, three hundred twenty million, nine hundred eighty-nine thousand, five hundred twelve".