666873 has 10 divisors (see below), whose sum is σ = 996314. Its totient is φ = 444528.

The previous prime is 666871. The next prime is 666889. The reversal of 666873 is 378666.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 480249 + 186624 = 693^2 + 432^2 .

It is not a de Polignac number, because 666873 - 2¹ = 666871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4036 + ... + 4197.

2⁶⁶⁶⁸⁷³ is an apocalyptic number.

It is an amenable number.

666873 is a deficient number, since it is larger than the sum of its proper divisors (329441).

666873 is an equidigital number, since it uses as much as digits as its factorization.

666873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8245 (or 8236 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 666873 is about 816.6229239986. The cubic root of 666873 is about 87.3670579825.

The spelling of 666873 in words is "six hundred sixty-six thousand, eight hundred seventy-three".