91766666 has 4 divisors (see below), whose sum is σ = 137650002. Its totient is φ = 45883332.

The previous prime is 91766659. The next prime is 91766669. The reversal of 91766666 is 66666719.

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., 88266025 + 3500641 = 9395^2 + 1871^2 .

It is a super-2 number, since 2×91766666² = 16842241977511112, 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 91766666.

It is not an unprimeable number, because it can be changed into a prime (91766669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22941665 + ... + 22941668.

Almost surely, 2^91766666 is an apocalyptic number.

91766666 is a deficient number, since it is larger than the sum of its proper divisors (45883336).

91766666 is a wasteful number, since it uses less digits than its factorization.

91766666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45883335.

The product of its digits is 489888, while the sum is 47.

The square root of 91766666 is about 9579.4919489501. The cubic root of 91766666 is about 451.0537707745.

The spelling of 91766666 in words is "ninety-one million, seven hundred sixty-six thousand, six hundred sixty-six".