91668163 has 2 divisors, whose sum is σ = 91668164. Its totient is φ = 91668162.

The previous prime is 91668151. The next prime is 91668173. The reversal of 91668163 is 36186619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91668163 - 2¹⁷ = 91537091 is a prime.

It is not a weakly prime, because it can be changed into another prime (91668113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45834081 + 45834082.

It is an arithmetic number, because the mean of its divisors is an integer number (45834082).

Almost surely, 2^91668163 is an apocalyptic number.

91668163 is a deficient number, since it is larger than the sum of its proper divisors (1).

91668163 is an equidigital number, since it uses as much as digits as its factorization.

91668163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 91668163 is about 9574.3492207042. The cubic root of 91668163 is about 450.8923248733.

The spelling of 91668163 in words is "ninety-one million, six hundred sixty-eight thousand, one hundred sixty-three".