166499 has 4 divisors (see below), whose sum is σ = 167664. Its totient is φ = 165336.

The previous prime is 166487. The next prime is 166541. The reversal of 166499 is 994661.

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 2^k-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.

It is not an unprimeable number, because it can be changed into a prime (166409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 332 + ... + 665.

It is an arithmetic number, because the mean of its divisors is an integer number (41916).

2¹⁶⁶⁴⁹⁹ is an apocalyptic number.

166499 is a deficient number, since it is larger than the sum of its proper divisors (1165).

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 product of its digits is 11664, while the sum is 35.

The square root of 166499 is about 408.0428899025. The cubic root of 166499 is about 55.0136605187.

Subtracting from 166499 its sum of digits (35), we obtain a square (166464 = 408²).

The spelling of 166499 in words is "one hundred sixty-six thousand, four hundred ninety-nine".