19979539799 has 8 divisors (see below), whose sum is σ = 21452763168. Its totient is φ = 18539422720.

The previous prime is 19979539759. The next prime is 19979539837. The reversal of 19979539799 is 99793597991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19979539799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19979539739) 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, 8275322 + ... + 8277735.

It is an arithmetic number, because the mean of its divisors is an integer number (2681595396).

Almost surely, 2^19979539799 is an apocalyptic number.

19979539799 is a deficient number, since it is larger than the sum of its proper divisors (1473223369).

19979539799 is a wasteful number, since it uses less digits than its factorization.

19979539799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16553145.

The product of its digits is 390609135, while the sum is 77.

The spelling of 19979539799 in words is "nineteen billion, nine hundred seventy-nine million, five hundred thirty-nine thousand, seven hundred ninety-nine".