19798616597 has 2 divisors, whose sum is σ = 19798616598. Its totient is φ = 19798616596.

The previous prime is 19798616587. The next prime is 19798616609. The reversal of 19798616597 is 79561689791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19236025636 + 562590961 = 138694^2 + 23719^2 .

It is a cyclic number.

It is not a de Polignac number, because 19798616597 - 2⁶ = 19798616533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19798616507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9899308298 + 9899308299.

It is an arithmetic number, because the mean of its divisors is an integer number (9899308299).

Almost surely, 2^19798616597 is an apocalyptic number.

It is an amenable number.

19798616597 is a deficient number, since it is larger than the sum of its proper divisors (1).

19798616597 is an equidigital number, since it uses as much as digits as its factorization.

19798616597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51438240, while the sum is 68.

The spelling of 19798616597 in words is "nineteen billion, seven hundred ninety-eight million, six hundred sixteen thousand, five hundred ninety-seven".