Subtracting from 166499 its sum of digits (35), we obtain a square (166464 = 4082).
166499 is nontrivially palindromic in base 3.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 994661 = 47 ⋅21163.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-166499 is a prime.
It is a deceptive number, since it divides R166498.
It is a Duffinian number.
It is a plaindrome in base 15.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 166499.
2166499 is an apocalyptic number.
166499 is an equidigital number, since it uses as much as digits as its factorization.
166499 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1164.
The square root of 166499 is about 408.0428899025. The cubic root of 166499 is about 55.0136605187.
The spelling of 166499 in words is "one hundred sixty-six thousand, four hundred ninety-nine".