19866596799 has 12 divisors (see below), whose sum is σ = 30813497304. Its totient is φ = 11352340944.

The previous prime is 19866596779. The next prime is 19866596801. The reversal of 19866596799 is 99769566891.

It is not a de Polignac number, because 19866596799 - 2¹⁹ = 19866072511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19866596799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19866596779) 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, 67573312 + ... + 67573605.

It is an arithmetic number, because the mean of its divisors is an integer number (2567791442).

Almost surely, 2^19866596799 is an apocalyptic number.

19866596799 is a deficient number, since it is larger than the sum of its proper divisors (10946900505).

19866596799 is a wasteful number, since it uses less digits than its factorization.

19866596799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135146934 (or 135146927 counting only the distinct ones).

The product of its digits is 396809280, while the sum is 75.

The spelling of 19866596799 in words is "nineteen billion, eight hundred sixty-six million, five hundred ninety-six thousand, seven hundred ninety-nine".