666412 has 6 divisors (see below), whose sum is σ = 1166228. Its totient is φ = 333204.

The previous prime is 666403. The next prime is 666427. The reversal of 666412 is 214666.

It is a happy number.

It is a super-3 number, since 3×666412³ = 887870611303339584, which contains 333 as substring.

It is an unprimeable number.

666412 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 as a sum of consecutive naturals, namely, 83298 + ... + 83305.

2⁶⁶⁶⁴¹² is an apocalyptic number.

It is an amenable number.

666412 is a deficient number, since it is larger than the sum of its proper divisors (499816).

666412 is a wasteful number, since it uses less digits than its factorization.

666412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166607 (or 166605 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 666412 is about 816.3406151846. The cubic root of 666412 is about 87.3469214657.

The spelling of 666412 in words is "six hundred sixty-six thousand, four hundred twelve".