195053916781 has 2 divisors, whose sum is σ = 195053916782. Its totient is φ = 195053916780.

The previous prime is 195053916749. The next prime is 195053916803. The reversal of 195053916781 is 187619350591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170808624100 + 24245292681 = 413290^2 + 155709^2 .

It is a cyclic number.

It is not a de Polignac number, because 195053916781 - 2⁵ = 195053916749 is a prime.

It is a super-2 number, since 2×195053916781² (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 (195053916881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97526958390 + 97526958391.

It is an arithmetic number, because the mean of its divisors is an integer number (97526958391).

Almost surely, 2^195053916781 is an apocalyptic number.

It is an amenable number.

195053916781 is a deficient number, since it is larger than the sum of its proper divisors (1).

195053916781 is an equidigital number, since it uses as much as digits as its factorization.

195053916781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 55.

The spelling of 195053916781 in words is "one hundred ninety-five billion, fifty-three million, nine hundred sixteen thousand, seven hundred eighty-one".