91666660 has 12 divisors (see below), whose sum is σ = 192500028. Its totient is φ = 36666656.

The previous prime is 91666633. The next prime is 91666667. The reversal of 91666660 is 6666619.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33663204 + 58003456 = 5802^2 + 7616^2 .

It is not an unprimeable number, because it can be changed into a prime (91666667) 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, 2291647 + ... + 2291686.

It is an arithmetic number, because the mean of its divisors is an integer number (16041669).

Almost surely, 2^91666660 is an apocalyptic number.

It is an amenable number.

91666660 is an abundant number, since it is smaller than the sum of its proper divisors (100833368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91666660 is a wasteful number, since it uses less digits than its factorization.

91666660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4583342 (or 4583340 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 91666660 is about 9574.2707294081. The cubic root of 91666660 is about 450.8898605685.

It can be divided in two parts, 916 and 66660, that added together give a palindrome (67576).

The spelling of 91666660 in words is "ninety-one million, six hundred sixty-six thousand, six hundred sixty".