9718475797817 has 2 divisors, whose sum is σ = 9718475797818. Its totient is φ = 9718475797816.

The previous prime is 9718475797801. The next prime is 9718475797879. The reversal of 9718475797817 is 7187975748179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8723611187776 + 994864610041 = 2953576^2 + 997429^2 .

It is a cyclic number.

It is not a de Polignac number, because 9718475797817 - 2⁴ = 9718475797801 is a prime.

It is a super-3 number, since 3×9718475797817³ (a number of 40 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (9718474797817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4859237898908 + 4859237898909.

It is an arithmetic number, because the mean of its divisors is an integer number (4859237898909).

Almost surely, 2^{9718475797817} is an apocalyptic number.

It is an amenable number.

9718475797817 is a deficient number, since it is larger than the sum of its proper divisors (1).

9718475797817 is an equidigital number, since it uses as much as digits as its factorization.

9718475797817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1742549760, while the sum is 80.

The spelling of 9718475797817 in words is "nine trillion, seven hundred eighteen billion, four hundred seventy-five million, seven hundred ninety-seven thousand, eight hundred seventeen".