19887534168 has 32 divisors (see below), whose sum is σ = 50201548800. Its totient is φ = 6564816288.

The previous prime is 19887534143. The next prime is 19887534187. The reversal of 19887534168 is 86143578891.

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, 4020088 + ... + 4025031.

It is an arithmetic number, because the mean of its divisors is an integer number (1568798400).

Almost surely, 2^19887534168 is an apocalyptic number.

It is an amenable number.

19887534168 is an abundant number, since it is smaller than the sum of its proper divisors (30314014632).

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

19887534168 is a wasteful number, since it uses less digits than its factorization.

19887534168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8045231 (or 8045227 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 60.

The spelling of 19887534168 in words is "nineteen billion, eight hundred eighty-seven million, five hundred thirty-four thousand, one hundred sixty-eight".