195159520274681 has 2 divisors, whose sum is σ = 195159520274682. Its totient is φ = 195159520274680.

The previous prime is 195159520274657. The next prime is 195159520274683. The reversal of 195159520274681 is 186472025951591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170084373889600 + 25075146385081 = 13041640^2 + 5007509^2 .

It is a cyclic number.

It is not a de Polignac number, because 195159520274681 - 2³⁴ = 195142340405497 is a prime.

It is a super-2 number, since 2×195159520274681² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 195159520274683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (195159520274683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97579760137340 + 97579760137341.

It is an arithmetic number, because the mean of its divisors is an integer number (97579760137341).

Almost surely, 2^{195159520274681} is an apocalyptic number.

It is an amenable number.

195159520274681 is a deficient number, since it is larger than the sum of its proper divisors (1).

195159520274681 is an equidigital number, since it uses as much as digits as its factorization.

195159520274681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432000, while the sum is 65.

The spelling of 195159520274681 in words is "one hundred ninety-five trillion, one hundred fifty-nine billion, five hundred twenty million, two hundred seventy-four thousand, six hundred eighty-one".