666446 has 8 divisors (see below), whose sum is σ = 1090584. Its totient is φ = 302920.

The previous prime is 666439. The next prime is 666461. The reversal of 666446 is 644666.

It is a happy number.

666446 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

666446 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, 15125 + ... + 15168.

It is an arithmetic number, because the mean of its divisors is an integer number (136323).

2⁶⁶⁶⁴⁴⁶ is an apocalyptic number.

666446 is a deficient number, since it is larger than the sum of its proper divisors (424138).

666446 is a wasteful number, since it uses less digits than its factorization.

666446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30306.

The product of its digits is 20736, while the sum is 32.

The square root of 666446 is about 816.3614395597. The cubic root of 666446 is about 87.3484069055.

The spelling of 666446 in words is "six hundred sixty-six thousand, four hundred forty-six".