91666529 has 8 divisors (see below), whose sum is σ = 94961160. Its totient is φ = 88422400.

The previous prime is 91666517. The next prime is 91666577. The reversal of 91666529 is 92566619.

It can be written as a sum of positive squares in 4 ways, for example, as 559504 + 91107025 = 748^2 + 9545^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91666529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91666529.

It is not an unprimeable number, because it can be changed into a prime (91666229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8912 + ... + 16209.

It is an arithmetic number, because the mean of its divisors is an integer number (11870145).

Almost surely, 2^91666529 is an apocalyptic number.

It is an amenable number.

91666529 is a deficient number, since it is larger than the sum of its proper divisors (3294631).

91666529 is a wasteful number, since it uses less digits than its factorization.

91666529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25251.

The product of its digits is 174960, while the sum is 44.

The square root of 91666529 is about 9574.2638881535. The cubic root of 91666529 is about 450.8896457809.

The spelling of 91666529 in words is "ninety-one million, six hundred sixty-six thousand, five hundred twenty-nine".