91666866619 has 2 divisors, whose sum is σ = 91666866620. Its totient is φ = 91666866618.

The previous prime is 91666866589. The next prime is 91666866647.

91666866619 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 91666866619 - 2¹¹ = 91666864571 is a prime.

It is a super-2 number, since 2×91666866619² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91666806619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45833433309 + 45833433310.

It is an arithmetic number, because the mean of its divisors is an integer number (45833433310).

Almost surely, 2^91666866619 is an apocalyptic number.

91666866619 is a deficient number, since it is larger than the sum of its proper divisors (1).

91666866619 is an equidigital number, since it uses as much as digits as its factorization.

91666866619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30233088, while the sum is 64.

The spelling of 91666866619 in words is "ninety-one billion, six hundred sixty-six million, eight hundred sixty-six thousand, six hundred nineteen".