666343 has 4 divisors (see below), whose sum is σ = 673920. Its totient is φ = 658768.

The previous prime is 666329. The next prime is 666353. The reversal of 666343 is 343666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666353) 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 3 ways as a sum of consecutive naturals, for example, 3655 + ... + 3832.

It is an arithmetic number, because the mean of its divisors is an integer number (168480).

2⁶⁶⁶³⁴³ is an apocalyptic number.

666343 is a deficient number, since it is larger than the sum of its proper divisors (7577).

666343 is an equidigital number, since it uses as much as digits as its factorization.

666343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7576.

The product of its digits is 7776, while the sum is 28.

The square root of 666343 is about 816.2983523198. The cubic root of 666343 is about 87.3439067412.

The spelling of 666343 in words is "six hundred sixty-six thousand, three hundred forty-three".