19881000960 has 200 divisors, whose sum is σ = 64424507520. Its totient is φ = 5234491392.

The previous prime is 19881000959. The next prime is 19881001037. The reversal of 19881000960 is 6900018891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251658201 + ... + 251658279.

Almost surely, 2^19881000960 is an apocalyptic number.

19881000960 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 19881000960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32212253760).

19881000960 is an abundant number, since it is smaller than the sum of its proper divisors (44543506560).

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

19881000960 is an frugal number, since it uses more digits than its factorization.

19881000960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The spelling of 19881000960 in words is "nineteen billion, eight hundred eighty-one million, nine hundred sixty", and thus it is an aban number.