166116786 has 80 divisors (see below), whose sum is σ = 383427840. Its totient is φ = 47916000.

The previous prime is 166116773. The next prime is 166116793. The reversal of 166116786 is 687611661.

Its product of digits (72576) is a multiple of the sum of its prime divisors (108).

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 2723196 + ... + 2723256.

It is an arithmetic number, because the mean of its divisors is an integer number (4792848).

Almost surely, 2^166116786 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166116786, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191713920).

166116786 is an abundant number, since it is smaller than the sum of its proper divisors (217311054).

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

166116786 is an equidigital number, since it uses as much as digits as its factorization.

166116786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 108 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 166116786 is about 12888.6301056396. The cubic root of 166116786 is about 549.7153193410.

The spelling of 166116786 in words is "one hundred sixty-six million, one hundred sixteen thousand, seven hundred eighty-six".