195191917717 has 2 divisors, whose sum is σ = 195191917718. Its totient is φ = 195191917716.

The previous prime is 195191917597. The next prime is 195191917729. The reversal of 195191917717 is 717719191591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195181938436 + 9979281 = 441794^2 + 3159^2 .

It is a cyclic number.

It is not a de Polignac number, because 195191917717 - 2⁷ = 195191917589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195194917717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97595958858 + 97595958859.

It is an arithmetic number, because the mean of its divisors is an integer number (97595958859).

Almost surely, 2^195191917717 is an apocalyptic number.

It is an amenable number.

195191917717 is a deficient number, since it is larger than the sum of its proper divisors (1).

195191917717 is an equidigital number, since it uses as much as digits as its factorization.

195191917717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1250235, while the sum is 58.

The spelling of 195191917717 in words is "one hundred ninety-five billion, one hundred ninety-one million, nine hundred seventeen thousand, seven hundred seventeen".