195194917717 has 2 divisors, whose sum is σ = 195194917718. Its totient is φ = 195194917716.

The previous prime is 195194917693. The next prime is 195194917721. The reversal of 195194917717 is 717719491591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181822076836 + 13372840881 = 426406^2 + 115641^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195194917717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195194917777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97597458858 + 97597458859.

It is an arithmetic number, because the mean of its divisors is an integer number (97597458859).

Almost surely, 2^195194917717 is an apocalyptic number.

It is an amenable number.

195194917717 is a deficient number, since it is larger than the sum of its proper divisors (1).

195194917717 is an equidigital number, since it uses as much as digits as its factorization.

195194917717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5000940, while the sum is 61.

The spelling of 195194917717 in words is "one hundred ninety-five billion, one hundred ninety-four million, nine hundred seventeen thousand, seven hundred seventeen".