19685821968 has 60 divisors (see below), whose sum is σ = 55191043440. Its totient is φ = 6550258368.

The previous prime is 19685821913. The next prime is 19685821999. The reversal of 19685821968 is 86912858691.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40338 + ... + 202481.

It is an arithmetic number, because the mean of its divisors is an integer number (919850724).

Almost surely, 2^19685821968 is an apocalyptic number.

19685821968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19685821968 is an abundant number, since it is smaller than the sum of its proper divisors (35505221472).

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

19685821968 is a wasteful number, since it uses less digits than its factorization.

19685821968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243396 (or 243387 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 63.

The spelling of 19685821968 in words is "nineteen billion, six hundred eighty-five million, eight hundred twenty-one thousand, nine hundred sixty-eight".