166666668 has 72 divisors (see below), whose sum is σ = 451245312. Its totient is φ = 46899648.

The previous prime is 166666649. The next prime is 166666673. The reversal of 166666668 is 866666661.

Its product of digits (2239488) is a multiple of the sum of its prime divisors (288).

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 166666668.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 997921 + ... + 998087.

It is an arithmetic number, because the mean of its divisors is an integer number (6267296).

Almost surely, 2^166666668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166666668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225622656).

166666668 is an abundant number, since it is smaller than the sum of its proper divisors (284578644).

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

166666668 is a wasteful number, since it uses less digits than its factorization.

166666668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 288 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 51.

The square root of 166666668 is about 12909.9445389978. The cubic root of 166666668 is about 550.3212096166.

The spelling of 166666668 in words is "one hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-eight".