19979535696 has 20 divisors (see below), whose sum is σ = 51613800672. Its totient is φ = 6659845216.

The previous prime is 19979535689. The next prime is 19979535707. The reversal of 19979535696 is 69653597991.

It is a self number, because there is not a number n which added to its sum of digits gives 19979535696.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208120116 + ... + 208120211.

Almost surely, 2^19979535696 is an apocalyptic number.

19979535696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19979535696 is an abundant number, since it is smaller than the sum of its proper divisors (31634264976).

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

19979535696 is a wasteful number, since it uses less digits than its factorization.

19979535696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416240338 (or 416240332 counting only the distinct ones).

The product of its digits is 124002900, while the sum is 69.

The spelling of 19979535696 in words is "nineteen billion, nine hundred seventy-nine million, five hundred thirty-five thousand, six hundred ninety-six".