191013665357 has 2 divisors, whose sum is σ = 191013665358. Its totient is φ = 191013665356.

The previous prime is 191013665317. The next prime is 191013665399. The reversal of 191013665357 is 753566310191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154475725156 + 36537940201 = 393034^2 + 191149^2 .

It is a cyclic number.

It is not a de Polignac number, because 191013665357 - 2¹⁰ = 191013664333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191013665317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95506832678 + 95506832679.

It is an arithmetic number, because the mean of its divisors is an integer number (95506832679).

Almost surely, 2^191013665357 is an apocalyptic number.

It is an amenable number.

191013665357 is a deficient number, since it is larger than the sum of its proper divisors (1).

191013665357 is an equidigital number, since it uses as much as digits as its factorization.

191013665357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 510300, while the sum is 47.

The spelling of 191013665357 in words is "one hundred ninety-one billion, thirteen million, six hundred sixty-five thousand, three hundred fifty-seven".