66166 has 4 divisors (see below), whose sum is σ = 99252. Its totient is φ = 33082.

The previous prime is 66161. The next prime is 66169.

66166 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 66166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66161) 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 as a sum of consecutive naturals, namely, 16540 + ... + 16543.

It is an arithmetic number, because the mean of its divisors is an integer number (24813).

2⁶⁶¹⁶⁶ is an apocalyptic number.

66166 is a deficient number, since it is larger than the sum of its proper divisors (33086).

66166 is a wasteful number, since it uses less digits than its factorization.

66166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33085.

The product of its digits is 1296, while the sum is 25.

The square root of 66166 is about 257.2275257433. The cubic root of 66166 is about 40.4462529437.

It can be divided in two parts, 661 and 66, that added together give a palindrome (727).

The spelling of 66166 in words is "sixty-six thousand, one hundred sixty-six".