12666 has 8 divisors (see below), whose sum is σ = 25344. Its totient is φ = 4220.

The previous prime is 12659. The next prime is 12671. The reversal of 12666 is 66621.

It is a sphenic number, since it is the product of 3 distinct primes.

12666 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

12666 is a modest number, since divided by 666 gives 12 as remainder.

It is a plaindrome in base 10 and base 14.

It is an unprimeable number.

12666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050 + ... + 1061.

It is an arithmetic number, because the mean of its divisors is an integer number (3168).

2¹²⁶⁶⁶ is an apocalyptic number.

12666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12672).

12666 is a wasteful number, since it uses less digits than its factorization.

12666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116.

The product of its digits is 432, while the sum is 21.

The square root of 12666 is about 112.5433249909. The cubic root of 12666 is about 23.3102265582.

The spelling of 12666 in words is "twelve thousand, six hundred sixty-six".