666143 has 2 divisors, whose sum is σ = 666144. Its totient is φ = 666142.

The previous prime is 666139. The next prime is 666167. The reversal of 666143 is 341666.

666143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666143 - 2² = 666139 is a prime.

It is a plaindrome in base 9.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333071 + 333072.

It is an arithmetic number, because the mean of its divisors is an integer number (333072).

2⁶⁶⁶¹⁴³ is an apocalyptic number.

666143 is a deficient number, since it is larger than the sum of its proper divisors (1).

666143 is an equidigital number, since it uses as much as digits as its factorization.

666143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 666143 is about 816.1758388975. The cubic root of 666143 is about 87.3351672335.

The spelling of 666143 in words is "six hundred sixty-six thousand, one hundred forty-three".