19881672688 has 20 divisors (see below), whose sum is σ = 38644611408. Its totient is φ = 9908869760.

The previous prime is 19881672659. The next prime is 19881672691. The reversal of 19881672688 is 88627618891.

It is a happy number.

It is a congruent number.

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, 1992781 + ... + 2002732.

Almost surely, 2^19881672688 is an apocalyptic number.

It is an amenable number.

19881672688 is a deficient number, since it is larger than the sum of its proper divisors (18762938720).

19881672688 is a wasteful number, since it uses less digits than its factorization.

19881672688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3995832 (or 3995826 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 64.

The spelling of 19881672688 in words is "nineteen billion, eight hundred eighty-one million, six hundred seventy-two thousand, six hundred eighty-eight".