166 is nontrivially palindromic in base 6 and base 11.
166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
166 is an esthetic number in base 6 and base 14, because in such bases its adjacent digits differ by 1.
It is a semiprime because it is the product of two primes.
166 is an undulating number in base 6 and base 11.
It is a plaindrome in base 8, base 10, base 12 and base 14.
It is a nialpdrome in base 13, base 15 and base 16.
It is a congruent number.
It is a panconsummate number.
166 is the 11-th centered triangular number.
166 is an equidigital number, since it uses as much as digits as its factorization.
166 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 85.
The square root of 166 is about 12.8840987267. The cubic root of 166 is about 5.4958646601.
Subtracting from 166 its sum of digits (13), we obtain a triangular number (153 = T17).
Adding to 166 its product of digits (36), we get a palindrome (202).
The spelling of 166 in words is "one hundred sixty-six", and thus it is an aban number.