19900759717 has 2 divisors, whose sum is σ = 19900759718. Its totient is φ = 19900759716.

The previous prime is 19900759709. The next prime is 19900759817. The reversal of 19900759717 is 71795700991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18692084961 + 1208674756 = 136719^2 + 34766^2 .

It is a cyclic number.

It is not a de Polignac number, because 19900759717 - 2³ = 19900759709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19900759517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950379858 + 9950379859.

It is an arithmetic number, because the mean of its divisors is an integer number (9950379859).

Almost surely, 2^19900759717 is an apocalyptic number.

It is an amenable number.

19900759717 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900759717 is an equidigital number, since it uses as much as digits as its factorization.

19900759717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1250235, while the sum is 55.

The spelling of 19900759717 in words is "nineteen billion, nine hundred million, seven hundred fifty-nine thousand, seven hundred seventeen".