666844 has 12 divisors (see below), whose sum is σ = 1194424. Its totient is φ = 325584.

The previous prime is 666829. The next prime is 666857. The reversal of 666844 is 448666.

666844 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1767 + ... + 2110.

2⁶⁶⁶⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

666844 is a deficient number, since it is larger than the sum of its proper divisors (527580).

666844 is a wasteful number, since it uses less digits than its factorization.

666844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3924 (or 3922 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 666844 is about 816.6051677524. The cubic root of 666844 is about 87.3657915337.

It can be divided in two parts, 6668 and 44, that multiplied together give a palindrome (293392).

The spelling of 666844 in words is "six hundred sixty-six thousand, eight hundred forty-four".