19979522659 has 2 divisors, whose sum is σ = 19979522660. Its totient is φ = 19979522658.

The previous prime is 19979522639. The next prime is 19979522743. The reversal of 19979522659 is 95622597991.

It is a weak prime.

It is an emirp because it is prime and its reverse (95622597991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19979522659 - 2⁵ = 19979522627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19979522659.

It is not a weakly prime, because it can be changed into another prime (19979522639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9989761329 + 9989761330.

It is an arithmetic number, because the mean of its divisors is an integer number (9989761330).

Almost surely, 2^19979522659 is an apocalyptic number.

19979522659 is a deficient number, since it is larger than the sum of its proper divisors (1).

19979522659 is an equidigital number, since it uses as much as digits as its factorization.

19979522659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27556200, while the sum is 64.

The spelling of 19979522659 in words is "nineteen billion, nine hundred seventy-nine million, five hundred twenty-two thousand, six hundred fifty-nine".