91660118 has 16 divisors (see below), whose sum is σ = 154828800. Its totient is φ = 40319400.

The previous prime is 91660117. The next prime is 91660157. The reversal of 91660118 is 81106619.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91660111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66518 + ... + 67881.

It is an arithmetic number, because the mean of its divisors is an integer number (9676800).

Almost surely, 2^91660118 is an apocalyptic number.

91660118 is a deficient number, since it is larger than the sum of its proper divisors (63168682).

91660118 is a wasteful number, since it uses less digits than its factorization.

91660118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134443.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 91660118 is about 9573.9290784923. The cubic root of 91660118 is about 450.8791340527.

It can be divided in two parts, 916601 and 18, that added together give a palindrome (916619).

The spelling of 91660118 in words is "ninety-one million, six hundred sixty thousand, one hundred eighteen".