19868430868 has 54 divisors (see below), whose sum is σ = 41181014238. Its totient is φ = 8331713280.

The previous prime is 19868430847. The next prime is 19868430871. The reversal of 19868430868 is 86803486891.

It can be written as a sum of positive squares in 3 ways, for example, as 816702084 + 19051728784 = 28578^2 + 138028^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11179996 + ... + 11181772.

Almost surely, 2^19868430868 is an apocalyptic number.

It is an amenable number.

19868430868 is an abundant number, since it is smaller than the sum of its proper divisors (21312583370).

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

19868430868 is a wasteful number, since it uses less digits than its factorization.

19868430868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3593 (or 1803 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 61.

The spelling of 19868430868 in words is "nineteen billion, eight hundred sixty-eight million, four hundred thirty thousand, eight hundred sixty-eight".