19805960717 has 4 divisors (see below), whose sum is σ = 19806775296. Its totient is φ = 19805146140.

The previous prime is 19805960711. The next prime is 19805960737. The reversal of 19805960717 is 71706950891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19805960717 - 2⁴ = 19805960701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19805960711) 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 in 3 ways as a sum of consecutive naturals, for example, 369659 + ... + 419832.

It is an arithmetic number, because the mean of its divisors is an integer number (4951693824).

Almost surely, 2^19805960717 is an apocalyptic number.

It is an amenable number.

19805960717 is a deficient number, since it is larger than the sum of its proper divisors (814579).

19805960717 is an equidigital number, since it uses as much as digits as its factorization.

19805960717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814578.

The product of its (nonzero) digits is 952560, while the sum is 53.

The spelling of 19805960717 in words is "nineteen billion, eight hundred five million, nine hundred sixty thousand, seven hundred seventeen".