18885981985800 has 96 divisors (see below), whose sum is σ = 58554640819680. Its totient is φ = 5035565376000.

The previous prime is 18885981985789. The next prime is 18885981985817. The reversal of 18885981985800 is 858918958881.

It is a super-2 number, since 2×18885981985800² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2172900 + ... + 6518700.

It is an arithmetic number, because the mean of its divisors is an integer number (609944175205).

Almost surely, 2^{18885981985800} is an apocalyptic number.

18885981985800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 4345800×4345801.

It is an amenable number.

18885981985800 is an abundant number, since it is smaller than the sum of its proper divisors (39668658833880).

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

18885981985800 is a wasteful number, since it uses less digits than its factorization.

18885981985800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4353063 (or 4353054 counting only the distinct ones).

The product of its (nonzero) digits is 530841600, while the sum is 78.

The spelling of 18885981985800 in words is "eighteen trillion, eight hundred eighty-five billion, nine hundred eighty-one million, nine hundred eighty-five thousand, eight hundred".