666112 has 20 divisors (see below), whose sum is σ = 1331946. Its totient is φ = 332800.

The previous prime is 666109. The next prime is 666119. The reversal of 666112 is 211666.

It can be written as a sum of positive squares in only one way, i.e., 665856 + 256 = 816^2 + 16^2 .

It is not an unprimeable number, because it can be changed into a prime (666119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139 + ... + 1162.

2⁶⁶⁶¹¹² is an apocalyptic number.

It is an amenable number.

666112 is a deficient number, since it is larger than the sum of its proper divisors (665834).

666112 is an equidigital number, since it uses as much as digits as its factorization.

666112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319 (or 1303 counting only the distinct ones).

The product of its digits is 432, while the sum is 22.

The square root of 666112 is about 816.1568476708. The cubic root of 666112 is about 87.3338124533. Note that the first 3 decimals are identical.

Adding to 666112 its reverse (211666), we get a palindrome (877778).

The spelling of 666112 in words is "six hundred sixty-six thousand, one hundred twelve".