19687134864 has 20 divisors (see below), whose sum is σ = 50858431856. Its totient is φ = 6562378272.

The previous prime is 19687134781. The next prime is 19687134889. The reversal of 19687134864 is 46843178691.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205074274 + ... + 205074369.

Almost surely, 2^19687134864 is an apocalyptic number.

It is an amenable number.

19687134864 is an abundant number, since it is smaller than the sum of its proper divisors (31171296992).

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

19687134864 is a wasteful number, since it uses less digits than its factorization.

19687134864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410148654 (or 410148648 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 57.

The spelling of 19687134864 in words is "nineteen billion, six hundred eighty-seven million, one hundred thirty-four thousand, eight hundred sixty-four".