19879321979 has 8 divisors (see below), whose sum is σ = 21696245760. Its totient is φ = 18064017000.

The previous prime is 19879321961. The next prime is 19879321997. The reversal of 19879321979 is 97912397891.

It is an interprime number because it is at equal distance from previous prime (19879321961) and next prime (19879321997).

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

It is a cyclic number.

It is not a de Polignac number, because 19879321979 - 2⁸ = 19879321723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19879321379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 378947 + ... + 428204.

It is an arithmetic number, because the mean of its divisors is an integer number (2712030720).

Almost surely, 2^19879321979 is an apocalyptic number.

19879321979 is a deficient number, since it is larger than the sum of its proper divisors (1816923781).

19879321979 is a wasteful number, since it uses less digits than its factorization.

19879321979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809401.

The product of its digits is 15431472, while the sum is 65.

The spelling of 19879321979 in words is "nineteen billion, eight hundred seventy-nine million, three hundred twenty-one thousand, nine hundred seventy-nine".