195803687917 has 2 divisors, whose sum is σ = 195803687918. Its totient is φ = 195803687916.

The previous prime is 195803687879. The next prime is 195803687923. The reversal of 195803687917 is 719786308591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102469771881 + 93333916036 = 320109^2 + 305506^2 .

It is a cyclic number.

It is not a de Polignac number, because 195803687917 - 2¹⁵ = 195803655149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195803688917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97901843958 + 97901843959.

It is an arithmetic number, because the mean of its divisors is an integer number (97901843959).

Almost surely, 2^195803687917 is an apocalyptic number.

It is an amenable number.

195803687917 is a deficient number, since it is larger than the sum of its proper divisors (1).

195803687917 is an equidigital number, since it uses as much as digits as its factorization.

195803687917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22861440, while the sum is 64.

The spelling of 195803687917 in words is "one hundred ninety-five billion, eight hundred three million, six hundred eighty-seven thousand, nine hundred seventeen".