19798797659 has 2 divisors, whose sum is σ = 19798797660. Its totient is φ = 19798797658.

The previous prime is 19798797631. The next prime is 19798797661. The reversal of 19798797659 is 95679789791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19798797659 is a prime.

Together with 19798797661, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19798797659.

It is not a weakly prime, because it can be changed into another prime (19798797059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9899398829 + 9899398830.

It is an arithmetic number, because the mean of its divisors is an integer number (9899398830).

Almost surely, 2^19798797659 is an apocalyptic number.

19798797659 is a deficient number, since it is larger than the sum of its proper divisors (1).

19798797659 is an equidigital number, since it uses as much as digits as its factorization.

19798797659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540101520, while the sum is 77.

The spelling of 19798797659 in words is "nineteen billion, seven hundred ninety-eight million, seven hundred ninety-seven thousand, six hundred fifty-nine".