10666 has 4 divisors (see below), whose sum is σ = 16002. Its totient is φ = 5332.

The previous prime is 10663. The next prime is 10667. The reversal of 10666 is 66601.

It is a happy number.

10666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 5625 + 5041 = 75^2 + 71^2 .

It is a super-2 number, since 2×10666² = 227527112, which contains 22 as substring.

10666 is a modest number, since divided by 666 gives 10 as remainder.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (10663) 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, 2665 + ... + 2668.

2¹⁰⁶⁶⁶ is an apocalyptic number.

10666 is a deficient number, since it is larger than the sum of its proper divisors (5336).

10666 is an equidigital number, since it uses as much as digits as its factorization.

10666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5335.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 10666 is about 103.2763283623. The cubic root of 10666 is about 22.0123897154.

It can be divided in two parts, 106 and 66, that multiplied together give a palindrome (6996).

The spelling of 10666 in words is "ten thousand, six hundred sixty-six".