19879200689 has 2 divisors, whose sum is σ = 19879200690. Its totient is φ = 19879200688.

The previous prime is 19879200643. The next prime is 19879200697. The reversal of 19879200689 is 98600297891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17558370064 + 2320830625 = 132508^2 + 48175^2 .

It is a cyclic number.

It is not a de Polignac number, because 19879200689 - 2²⁰ = 19878152113 is a prime.

It is not a weakly prime, because it can be changed into another prime (19879200619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9939600344 + 9939600345.

It is an arithmetic number, because the mean of its divisors is an integer number (9939600345).

Almost surely, 2^19879200689 is an apocalyptic number.

It is an amenable number.

19879200689 is a deficient number, since it is larger than the sum of its proper divisors (1).

19879200689 is an equidigital number, since it uses as much as digits as its factorization.

19879200689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 59.

The spelling of 19879200689 in words is "nineteen billion, eight hundred seventy-nine million, two hundred thousand, six hundred eighty-nine".