166018 has 4 divisors (see below), whose sum is σ = 249030. Its totient is φ = 83008.

The previous prime is 166013. The next prime is 166021. The reversal of 166018 is 810661.

166018 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 810661 = 83 ⋅9767.

It can be written as a sum of positive squares in only one way, i.e., 134689 + 31329 = 367^2 + 177^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 166018.

It is not an unprimeable number, because it can be changed into a prime (166013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41503 + ... + 41506.

2¹⁶⁶⁰¹⁸ is an apocalyptic number.

166018 is a deficient number, since it is larger than the sum of its proper divisors (83012).

166018 is an equidigital number, since it uses as much as digits as its factorization.

166018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83011.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 166018 is about 407.4530647817. The cubic root of 166018 is about 54.9606329863.

Adding to 166018 its reverse (810661), we get a palindrome (976679).

The spelling of 166018 in words is "one hundred sixty-six thousand, eighteen".