18985660800 has 96 divisors (see below), whose sum is σ = 62534051880. Its totient is φ = 5062840320.

The previous prime is 18985660789. The next prime is 18985660817. The reversal of 18985660800 is 806658981.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 979237 + ... + 998436.

Almost surely, 2^18985660800 is an apocalyptic number.

18985660800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18985660800 is an abundant number, since it is smaller than the sum of its proper divisors (43548391080).

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

18985660800 is a wasteful number, since it uses less digits than its factorization.

18985660800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977700 (or 1977683 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 51.

The spelling of 18985660800 in words is "eighteen billion, nine hundred eighty-five million, six hundred sixty thousand, eight hundred".