91658666 has 8 divisors (see below), whose sum is σ = 149986944. Its totient is φ = 41663020.

The previous prime is 91658663. The next prime is 91658669. The reversal of 91658666 is 66685619.

It is an interprime number because it is at equal distance from previous prime (91658663) and next prime (91658669).

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

It is a super-2 number, since 2×91658666² = 16802622105799112, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 91658666.

It is not an unprimeable number, because it can be changed into a prime (91658663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083130 + ... + 2083173.

It is an arithmetic number, because the mean of its divisors is an integer number (18748368).

Almost surely, 2^91658666 is an apocalyptic number.

91658666 is a deficient number, since it is larger than the sum of its proper divisors (58328278).

91658666 is a wasteful number, since it uses less digits than its factorization.

91658666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166316.

The product of its digits is 466560, while the sum is 47.

The square root of 91658666 is about 9573.8532472563. The cubic root of 91658666 is about 450.8767532282.

The spelling of 91658666 in words is "ninety-one million, six hundred fifty-eight thousand, six hundred sixty-six".