91389185663 has 2 divisors, whose sum is σ = 91389185664. Its totient is φ = 91389185662.

The previous prime is 91389185639. The next prime is 91389185681. The reversal of 91389185663 is 36658198319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91389185663 - 2¹⁶ = 91389120127 is a prime.

It is a super-2 number, since 2×91389185663² (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 (91389185623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45694592831 + 45694592832.

It is an arithmetic number, because the mean of its divisors is an integer number (45694592832).

Almost surely, 2^91389185663 is an apocalyptic number.

91389185663 is a deficient number, since it is larger than the sum of its proper divisors (1).

91389185663 is an equidigital number, since it uses as much as digits as its factorization.

91389185663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8398080, while the sum is 59.

The spelling of 91389185663 in words is "ninety-one billion, three hundred eighty-nine million, one hundred eighty-five thousand, six hundred sixty-three".