195886546815809 has 2 divisors, whose sum is σ = 195886546815810. Its totient is φ = 195886546815808.

The previous prime is 195886546815767. The next prime is 195886546815811. The reversal of 195886546815809 is 908518645688591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193301194758400 + 2585352057409 = 13903280^2 + 1607903^2 .

It is a cyclic number.

It is not a de Polignac number, because 195886546815809 - 2¹⁶ = 195886546750273 is a prime.

Together with 195886546815811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195886546815829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97943273407904 + 97943273407905.

It is an arithmetic number, because the mean of its divisors is an integer number (97943273407905).

Almost surely, 2^{195886546815809} is an apocalyptic number.

It is an amenable number.

195886546815809 is a deficient number, since it is larger than the sum of its proper divisors (1).

195886546815809 is an equidigital number, since it uses as much as digits as its factorization.

195886546815809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5971968000, while the sum is 83.

The spelling of 195886546815809 in words is "one hundred ninety-five trillion, eight hundred eighty-six billion, five hundred forty-six million, eight hundred fifteen thousand, eight hundred nine".