166668 has 48 divisors (see below), whose sum is σ = 443520. Its totient is φ = 48384.

The previous prime is 166667. The next prime is 166669. The reversal of 166668 is 866661.

It is an interprime number because it is at equal distance from previous prime (166667) and next prime (166669).

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (166667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3855 + ... + 3897.

It is an arithmetic number, because the mean of its divisors is an integer number (9240).

166668 is a Friedman number, since it can be written as (8+(16-6)^6)/6, using all its digits and the basic arithmetic operations.

2¹⁶⁶⁶⁶⁸ 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 166668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221760).

166668 is an abundant number, since it is smaller than the sum of its proper divisors (276852).

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

166668 is a wasteful number, since it uses less digits than its factorization.

166668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86 (or 84 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 166668 is about 408.2499234538. The cubic root of 166668 is about 55.0322675668.

The spelling of 166668 in words is "one hundred sixty-six thousand, six hundred sixty-eight".