666912 has 24 divisors (see below), whose sum is σ = 1750896. Its totient is φ = 222272.

The previous prime is 666901. The next prime is 666929. The reversal of 666912 is 219666.

It is a tau number, because it is divible by the number of its divisors (24).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 666912.

It is an unprimeable number.

666912 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 in 3 ways as a sum of consecutive naturals, for example, 3378 + ... + 3569.

It is an arithmetic number, because the mean of its divisors is an integer number (72954).

2⁶⁶⁶⁹¹² is an apocalyptic number.

It is an amenable number.

666912 is an abundant number, since it is smaller than the sum of its proper divisors (1083984).

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

666912 is a wasteful number, since it uses less digits than its factorization.

666912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6960 (or 6952 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 666912 is about 816.6468024795. The cubic root of 666912 is about 87.3687610798.

The spelling of 666912 in words is "six hundred sixty-six thousand, nine hundred twelve".