991334726166 has 8 divisors (see below), whose sum is σ = 1982669452344. Its totient is φ = 330444908720.

The previous prime is 991334726147. The next prime is 991334726189. The reversal of 991334726166 is 661627433199.

991334726166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

991334726166 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82611227175 + ... + 82611227186.

It is an arithmetic number, because the mean of its divisors is an integer number (247833681543).

Almost surely, 2^991334726166 is an apocalyptic number.

991334726166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

991334726166 is a wasteful number, since it uses less digits than its factorization.

991334726166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165222454366.

The product of its digits is 8817984, while the sum is 57.

The spelling of 991334726166 in words is "nine hundred ninety-one billion, three hundred thirty-four million, seven hundred twenty-six thousand, one hundred sixty-six".