91666522 has 4 divisors (see below), whose sum is σ = 137499786. Its totient is φ = 45833260.

The previous prime is 91666517. The next prime is 91666577. The reversal of 91666522 is 22566619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22566619 = 239 ⋅94421.

It can be written as a sum of positive squares in only one way, i.e., 46090521 + 45576001 = 6789^2 + 6751^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22916629 + ... + 22916632.

Almost surely, 2^91666522 is an apocalyptic number.

91666522 is a deficient number, since it is larger than the sum of its proper divisors (45833264).

91666522 is a wasteful number, since it uses less digits than its factorization.

91666522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45833263.

The product of its digits is 38880, while the sum is 37.

The square root of 91666522 is about 9574.2635225901. The cubic root of 91666522 is about 450.8896343037.

The spelling of 91666522 in words is "ninety-one million, six hundred sixty-six thousand, five hundred twenty-two".