19799764839 has 12 divisors (see below), whose sum is σ = 28894503456. Its totient is φ = 13063761792.

The previous prime is 19799764807. The next prime is 19799764841. The reversal of 19799764839 is 93846799791.

19799764839 is a `hidden beast` number, since 1 + 9 + 79 + 9 + 76 + 483 + 9 = 666.

It is not a de Polignac number, because 19799764839 - 2⁵ = 19799764807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19799764639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11339199 + ... + 11340944.

It is an arithmetic number, because the mean of its divisors is an integer number (2407875288).

Almost surely, 2^19799764839 is an apocalyptic number.

19799764839 is a deficient number, since it is larger than the sum of its proper divisors (9094738617).

19799764839 is a wasteful number, since it uses less digits than its factorization.

19799764839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22680246 (or 22680243 counting only the distinct ones).

The product of its digits is 185177664, while the sum is 72.

The spelling of 19799764839 in words is "nineteen billion, seven hundred ninety-nine million, seven hundred sixty-four thousand, eight hundred thirty-nine".