199816632169717 has 2 divisors, whose sum is σ = 199816632169718. Its totient is φ = 199816632169716.

The previous prime is 199816632169697. The next prime is 199816632169729. The reversal of 199816632169717 is 717961236618991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195925359107556 + 3891273062161 = 13997334^2 + 1972631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199816632169717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199816632169417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99908316084858 + 99908316084859.

It is an arithmetic number, because the mean of its divisors is an integer number (99908316084859).

Almost surely, 2^{199816632169717} is an apocalyptic number.

It is an amenable number.

199816632169717 is a deficient number, since it is larger than the sum of its proper divisors (1).

199816632169717 is an equidigital number, since it uses as much as digits as its factorization.

199816632169717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 370355328, while the sum is 76.

The spelling of 199816632169717 in words is "one hundred ninety-nine trillion, eight hundred sixteen billion, six hundred thirty-two million, one hundred sixty-nine thousand, seven hundred seventeen".