91666886191 has 2 divisors, whose sum is σ = 91666886192. Its totient is φ = 91666886190.

The previous prime is 91666886159. The next prime is 91666886203. The reversal of 91666886191 is 19168866619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91666886191 - 2⁵ = 91666886159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91666886291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45833443095 + 45833443096.

It is an arithmetic number, because the mean of its divisors is an integer number (45833443096).

Almost surely, 2^91666886191 is an apocalyptic number.

91666886191 is a deficient number, since it is larger than the sum of its proper divisors (1).

91666886191 is an equidigital number, since it uses as much as digits as its factorization.

91666886191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 61.

The spelling of 91666886191 in words is "ninety-one billion, six hundred sixty-six million, eight hundred eighty-six thousand, one hundred ninety-one".