91327666 has 4 divisors (see below), whose sum is σ = 136991502. Its totient is φ = 45663832.

The previous prime is 91327651. The next prime is 91327679. The reversal of 91327666 is 66672319.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 89851441 + 1476225 = 9479^2 + 1215^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22831915 + ... + 22831918.

Almost surely, 2^91327666 is an apocalyptic number.

91327666 is a deficient number, since it is larger than the sum of its proper divisors (45663836).

91327666 is a wasteful number, since it uses less digits than its factorization.

91327666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45663835.

The product of its digits is 81648, while the sum is 40.

The square root of 91327666 is about 9556.5509468636. The cubic root of 91327666 is about 450.3333595709. Note that the first 4 decimals are identical.

The spelling of 91327666 in words is "ninety-one million, three hundred twenty-seven thousand, six hundred sixty-six".