666843 has 8 divisors (see below), whose sum is σ = 936000. Its totient is φ = 421128.

The previous prime is 666829. The next prime is 666857. The reversal of 666843 is 348666.

It is an interprime number because it is at equal distance from previous prime (666829) and next prime (666857).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666843 - 2⁵ = 666811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666823) 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 7 ways as a sum of consecutive naturals, for example, 5793 + ... + 5906.

It is an arithmetic number, because the mean of its divisors is an integer number (117000).

2⁶⁶⁶⁸⁴³ is an apocalyptic number.

666843 is a deficient number, since it is larger than the sum of its proper divisors (269157).

666843 is a wasteful number, since it uses less digits than its factorization.

666843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11721.

The product of its digits is 20736, while the sum is 33.

The square root of 666843 is about 816.6045554612. The cubic root of 666843 is about 87.3657478624.

The spelling of 666843 in words is "six hundred sixty-six thousand, eight hundred forty-three".