91666886140 has 24 divisors (see below), whose sum is σ = 192552629472. Its totient is φ = 36656817600.

The previous prime is 91666886089. The next prime is 91666886159. The reversal of 91666886140 is 4168866619.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545184 + ... + 693223.

It is an arithmetic number, because the mean of its divisors is an integer number (8023026228).

Almost surely, 2^91666886140 is an apocalyptic number.

It is an amenable number.

91666886140 is an abundant number, since it is smaller than the sum of its proper divisors (100885743332).

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

91666886140 is a wasteful number, since it uses less digits than its factorization.

91666886140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242117 (or 1242115 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 55.

The spelling of 91666886140 in words is "ninety-one billion, six hundred sixty-six million, eight hundred eighty-six thousand, one hundred forty".