91668905 has 16 divisors (see below), whose sum is σ = 112907520. Its totient is φ = 71409408.

The previous prime is 91668887. The next prime is 91668917. The reversal of 91668905 is 50986619.

It is a cyclic number.

It is not a de Polignac number, because 91668905 - 2⁸ = 91668649 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127136 + ... + 127854.

It is an arithmetic number, because the mean of its divisors is an integer number (7056720).

Almost surely, 2^91668905 is an apocalyptic number.

It is an amenable number.

91668905 is a deficient number, since it is larger than the sum of its proper divisors (21238615).

91668905 is a wasteful number, since it uses less digits than its factorization.

91668905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 91668905 is about 9574.3879699958. The cubic root of 91668905 is about 450.8935414396.

The spelling of 91668905 in words is "ninety-one million, six hundred sixty-eight thousand, nine hundred five".