19345718317 has 4 divisors (see below), whose sum is σ = 19346671260. Its totient is φ = 19344765376.

The previous prime is 19345718297. The next prime is 19345718321. The reversal of 19345718317 is 71381754391.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12461033641 + 6884684676 = 111629^2 + 82974^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19345718317 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19345718377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445342 + ... + 486847.

It is an arithmetic number, because the mean of its divisors is an integer number (4836667815).

Almost surely, 2^19345718317 is an apocalyptic number.

It is an amenable number.

19345718317 is a deficient number, since it is larger than the sum of its proper divisors (952943).

19345718317 is an equidigital number, since it uses as much as digits as its factorization.

19345718317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952942.

The product of its digits is 635040, while the sum is 49.

The spelling of 19345718317 in words is "nineteen billion, three hundred forty-five million, seven hundred eighteen thousand, three hundred seventeen".