666946 has 8 divisors (see below), whose sum is σ = 1143360. Its totient is φ = 285828.

The previous prime is 666937. The next prime is 666959. The reversal of 666946 is 649666.

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

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, 23806 + ... + 23833.

It is an arithmetic number, because the mean of its divisors is an integer number (142920).

2⁶⁶⁶⁹⁴⁶ is an apocalyptic number.

666946 is a deficient number, since it is larger than the sum of its proper divisors (476414).

666946 is a wasteful number, since it uses less digits than its factorization.

666946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47648.

The product of its digits is 46656, while the sum is 37.

The square root of 666946 is about 816.6676190471. The cubic root of 666946 is about 87.3702457771.

It can be divided in two parts, 666 and 946, that multiplied together give a palindrome (630036).

The spelling of 666946 in words is "six hundred sixty-six thousand, nine hundred forty-six".