91680204163 has 2 divisors, whose sum is σ = 91680204164. Its totient is φ = 91680204162.

The previous prime is 91680204149. The next prime is 91680204223. The reversal of 91680204163 is 36140208619.

It is a weak prime.

It is an emirp because it is prime and its reverse (36140208619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91680204163 - 2⁵ = 91680204131 is a prime.

It is not a weakly prime, because it can be changed into another prime (91680504163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45840102081 + 45840102082.

It is an arithmetic number, because the mean of its divisors is an integer number (45840102082).

Almost surely, 2^91680204163 is an apocalyptic number.

91680204163 is a deficient number, since it is larger than the sum of its proper divisors (1).

91680204163 is an equidigital number, since it uses as much as digits as its factorization.

91680204163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The spelling of 91680204163 in words is "ninety-one billion, six hundred eighty million, two hundred four thousand, one hundred sixty-three".