191689027757 has 2 divisors, whose sum is σ = 191689027758. Its totient is φ = 191689027756.

The previous prime is 191689027741. The next prime is 191689027769. The reversal of 191689027757 is 757720986191.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190051530601 + 1637497156 = 435949^2 + 40466^2 .

It is a cyclic number.

It is not a de Polignac number, because 191689027757 - 2⁴ = 191689027741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191689027757.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191689024757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95844513878 + 95844513879.

It is an arithmetic number, because the mean of its divisors is an integer number (95844513879).

Almost surely, 2^191689027757 is an apocalyptic number.

It is an amenable number.

191689027757 is a deficient number, since it is larger than the sum of its proper divisors (1).

191689027757 is an equidigital number, since it uses as much as digits as its factorization.

191689027757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13335840, while the sum is 62.

The spelling of 191689027757 in words is "one hundred ninety-one billion, six hundred eighty-nine million, twenty-seven thousand, seven hundred fifty-seven".