19749392717 has 2 divisors, whose sum is σ = 19749392718. Its totient is φ = 19749392716.

The previous prime is 19749392693. The next prime is 19749392759. The reversal of 19749392717 is 71729394791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17326193641 + 2423199076 = 131629^2 + 49226^2 .

It is a cyclic number.

It is not a de Polignac number, because 19749392717 - 2²⁶ = 19682283853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19749392017) 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, 9874696358 + 9874696359.

It is an arithmetic number, because the mean of its divisors is an integer number (9874696359).

Almost surely, 2^19749392717 is an apocalyptic number.

It is an amenable number.

19749392717 is a deficient number, since it is larger than the sum of its proper divisors (1).

19749392717 is an equidigital number, since it uses as much as digits as its factorization.

19749392717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6001128, while the sum is 59.

The spelling of 19749392717 in words is "nineteen billion, seven hundred forty-nine million, three hundred ninety-two thousand, seven hundred seventeen".