19900759817 has 2 divisors, whose sum is σ = 19900759818. Its totient is φ = 19900759816.

The previous prime is 19900759717. The next prime is 19900759831. The reversal of 19900759817 is 71895700991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10339635856 + 9561123961 = 101684^2 + 97781^2 .

It is a cyclic number.

It is not a de Polignac number, because 19900759817 - 2³⁴ = 2720890633 is a prime.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9950379908 + 9950379909.

It is an arithmetic number, because the mean of its divisors is an integer number (9950379909).

Almost surely, 2^19900759817 is an apocalyptic number.

It is an amenable number.

19900759817 is a deficient number, since it is larger than the sum of its proper divisors (1).

19900759817 is an equidigital number, since it uses as much as digits as its factorization.

19900759817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428840, while the sum is 56.

The spelling of 19900759817 in words is "nineteen billion, nine hundred million, seven hundred fifty-nine thousand, eight hundred seventeen".