195651994631 has 2 divisors, whose sum is σ = 195651994632. Its totient is φ = 195651994630.

The previous prime is 195651994621. The next prime is 195651994717. The reversal of 195651994631 is 136499156591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195651994631 - 2³⁰ = 194578252807 is a prime.

It is a super-2 number, since 2×195651994631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195651994621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97825997315 + 97825997316.

It is an arithmetic number, because the mean of its divisors is an integer number (97825997316).

Almost surely, 2^195651994631 is an apocalyptic number.

195651994631 is a deficient number, since it is larger than the sum of its proper divisors (1).

195651994631 is an equidigital number, since it uses as much as digits as its factorization.

195651994631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7873200, while the sum is 59.

The spelling of 195651994631 in words is "one hundred ninety-five billion, six hundred fifty-one million, nine hundred ninety-four thousand, six hundred thirty-one".