91680205187 has 2 divisors, whose sum is σ = 91680205188. Its totient is φ = 91680205186.

The previous prime is 91680205151. The next prime is 91680205207. The reversal of 91680205187 is 78150208619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91680205187 - 2¹⁰ = 91680204163 is a prime.

It is not a weakly prime, because it can be changed into another prime (91680205117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45840102593 + 45840102594.

It is an arithmetic number, because the mean of its divisors is an integer number (45840102594).

Almost surely, 2^91680205187 is an apocalyptic number.

91680205187 is a deficient number, since it is larger than the sum of its proper divisors (1).

91680205187 is an equidigital number, since it uses as much as digits as its factorization.

91680205187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 91680205187 in words is "ninety-one billion, six hundred eighty million, two hundred five thousand, one hundred eighty-seven".