666312 has 16 divisors (see below), whose sum is σ = 1665840. Its totient is φ = 222096.

The previous prime is 666301. The next prime is 666329. The reversal of 666312 is 213666.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 27763 = 666312 / (6 + 6 + 6 + 3 + 1 + 2).

It is a nude number because it is divisible by every one of its digits.

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, 13858 + ... + 13905.

It is an arithmetic number, because the mean of its divisors is an integer number (104115).

2⁶⁶⁶³¹² is an apocalyptic number.

It is an amenable number.

666312 is an abundant number, since it is smaller than the sum of its proper divisors (999528).

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

666312 is a wasteful number, since it uses less digits than its factorization.

666312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27772 (or 27768 counting only the distinct ones).

The product of its digits is 1296, while the sum is 24.

The square root of 666312 is about 816.2793639435. The cubic root of 666312 is about 87.3425522321.

Adding to 666312 its reverse (213666), we get a palindrome (879978).

The spelling of 666312 in words is "six hundred sixty-six thousand, three hundred twelve".