91680206599 has 2 divisors, whose sum is σ = 91680206600. Its totient is φ = 91680206598.

The previous prime is 91680206581. The next prime is 91680206621. The reversal of 91680206599 is 99560208619.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91680206599 - 2³³ = 83090272007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91680206549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45840103299 + 45840103300.

It is an arithmetic number, because the mean of its divisors is an integer number (45840103300).

Almost surely, 2^91680206599 is an apocalyptic number.

91680206599 is a deficient number, since it is larger than the sum of its proper divisors (1).

91680206599 is an equidigital number, since it uses as much as digits as its factorization.

91680206599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 55.

The spelling of 91680206599 in words is "ninety-one billion, six hundred eighty million, two hundred six thousand, five hundred ninety-nine".