201995816917 has 2 divisors, whose sum is σ = 201995816918. Its totient is φ = 201995816916.

The previous prime is 201995816899. The next prime is 201995816921. The reversal of 201995816917 is 719618599102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178562024356 + 23433792561 = 422566^2 + 153081^2 .

It is a cyclic number.

It is not a de Polignac number, because 201995816917 - 2¹⁵ = 201995784149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201995816987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100997908458 + 100997908459.

It is an arithmetic number, because the mean of its divisors is an integer number (100997908459).

Almost surely, 2^201995816917 is an apocalyptic number.

It is an amenable number.

201995816917 is a deficient number, since it is larger than the sum of its proper divisors (1).

201995816917 is an equidigital number, since it uses as much as digits as its factorization.

201995816917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2449440, while the sum is 58.

The spelling of 201995816917 in words is "two hundred one billion, nine hundred ninety-five million, eight hundred sixteen thousand, nine hundred seventeen".