91109844666 has 24 divisors (see below), whose sum is σ = 197541901440. Its totient is φ = 30348834696.

The previous prime is 91109844647. The next prime is 91109844691. The reversal of 91109844666 is 66644890119.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1732840 + ... + 1784643.

It is an arithmetic number, because the mean of its divisors is an integer number (8230912560).

Almost surely, 2^91109844666 is an apocalyptic number.

91109844666 is an abundant number, since it is smaller than the sum of its proper divisors (106432056774).

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

91109844666 is a wasteful number, since it uses less digits than its factorization.

91109844666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518930 (or 3518927 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The spelling of 91109844666 in words is "ninety-one billion, one hundred nine million, eight hundred forty-four thousand, six hundred sixty-six".