195981252517 has 2 divisors, whose sum is σ = 195981252518. Its totient is φ = 195981252516.

The previous prime is 195981252487. The next prime is 195981252539. The reversal of 195981252517 is 715252189591.

195981252517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132113348676 + 63867903841 = 363474^2 + 252721^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195981252517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195981252617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97990626258 + 97990626259.

It is an arithmetic number, because the mean of its divisors is an integer number (97990626259).

Almost surely, 2^195981252517 is an apocalyptic number.

It is an amenable number.

195981252517 is a deficient number, since it is larger than the sum of its proper divisors (1).

195981252517 is an equidigital number, since it uses as much as digits as its factorization.

195981252517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268000, while the sum is 55.

The spelling of 195981252517 in words is "one hundred ninety-five billion, nine hundred eighty-one million, two hundred fifty-two thousand, five hundred seventeen".