19889551800 has 144 divisors (see below), whose sum is σ = 66868774440. Its totient is φ = 5298082560.

The previous prime is 19889551741. The next prime is 19889551819. The reversal of 19889551800 is 815598891.

19889551800 is a `hidden beast` number, since 1 + 9 + 8 + 8 + 9 + 551 + 80 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1789059 + ... + 1800141.

Almost surely, 2^19889551800 is an apocalyptic number.

19889551800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19889551800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33434387220).

19889551800 is an abundant number, since it is smaller than the sum of its proper divisors (46979222640).

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

19889551800 is a wasteful number, since it uses less digits than its factorization.

19889551800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12102 (or 12090 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 54.

The spelling of 19889551800 in words is "nineteen billion, eight hundred eighty-nine million, five hundred fifty-one thousand, eight hundred".