91666886089 has 2 divisors, whose sum is σ = 91666886090. Its totient is φ = 91666886088.

The previous prime is 91666886081. The next prime is 91666886159. The reversal of 91666886089 is 98068866619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87426662400 + 4240223689 = 295680^2 + 65117^2 .

It is a cyclic number.

It is not a de Polignac number, because 91666886089 - 2³ = 91666886081 is a prime.

It is not a weakly prime, because it can be changed into another prime (91666886081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45833443044 + 45833443045.

It is an arithmetic number, because the mean of its divisors is an integer number (45833443045).

Almost surely, 2^91666886089 is an apocalyptic number.

It is an amenable number.

91666886089 is a deficient number, since it is larger than the sum of its proper divisors (1).

91666886089 is an equidigital number, since it uses as much as digits as its factorization.

91666886089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53747712, while the sum is 67.

The spelling of 91666886089 in words is "ninety-one billion, six hundred sixty-six million, eight hundred eighty-six thousand, eighty-nine".