19827998668 has 24 divisors (see below), whose sum is σ = 35912822400. Its totient is φ = 9567522048.

The previous prime is 19827998647. The next prime is 19827998669. The reversal of 19827998668 is 86689972891.

It is a self number, because there is not a number n which added to its sum of digits gives 19827998668.

It is not an unprimeable number, because it can be changed into a prime (19827998669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206821 + ... + 287107.

It is an arithmetic number, because the mean of its divisors is an integer number (1496367600).

Almost surely, 2^19827998668 is an apocalyptic number.

It is an amenable number.

19827998668 is a deficient number, since it is larger than the sum of its proper divisors (16084823732).

19827998668 is a wasteful number, since it uses less digits than its factorization.

19827998668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82449 (or 82447 counting only the distinct ones).

The product of its digits is 188116992, while the sum is 73.

The spelling of 19827998668 in words is "nineteen billion, eight hundred twenty-seven million, nine hundred ninety-eight thousand, six hundred sixty-eight".