19688942864 has 80 divisors (see below), whose sum is σ = 39750134400. Its totient is φ = 9441189888.

The previous prime is 19688942851. The next prime is 19688942881. The reversal of 19688942864 is 46824988691.

It is a super-2 number, since 2×19688942864² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19688942864.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9655157 + ... + 9657195.

It is an arithmetic number, because the mean of its divisors is an integer number (496876680).

Almost surely, 2^19688942864 is an apocalyptic number.

It is an amenable number.

19688942864 is an abundant number, since it is smaller than the sum of its proper divisors (20061191536).

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

19688942864 is a wasteful number, since it uses less digits than its factorization.

19688942864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352 (or 2346 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 65.

The spelling of 19688942864 in words is "nineteen billion, six hundred eighty-eight million, nine hundred forty-two thousand, eight hundred sixty-four".