195731953957 has 2 divisors, whose sum is σ = 195731953958. Its totient is φ = 195731953956.

The previous prime is 195731953951. The next prime is 195731953961. The reversal of 195731953957 is 759359137591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193394134756 + 2337819201 = 439766^2 + 48351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195731953957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195731953951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97865976978 + 97865976979.

It is an arithmetic number, because the mean of its divisors is an integer number (97865976979).

Almost surely, 2^195731953957 is an apocalyptic number.

It is an amenable number.

195731953957 is a deficient number, since it is larger than the sum of its proper divisors (1).

195731953957 is an equidigital number, since it uses as much as digits as its factorization.

195731953957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40186125, while the sum is 64.

The spelling of 195731953957 in words is "one hundred ninety-five billion, seven hundred thirty-one million, nine hundred fifty-three thousand, nine hundred fifty-seven".