666165443 has 2 divisors, whose sum is σ = 666165444. Its totient is φ = 666165442.

The previous prime is 666165433. The next prime is 666165463. The reversal of 666165443 is 344561666.

666165443 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 666165443 - 2⁸ = 666165187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666165443.

It is not a weakly prime, because it can be changed into another prime (666165433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333082721 + 333082722.

It is an arithmetic number, because the mean of its divisors is an integer number (333082722).

Almost surely, 2^666165443 is an apocalyptic number.

666165443 is a deficient number, since it is larger than the sum of its proper divisors (1).

666165443 is an equidigital number, since it uses as much as digits as its factorization.

666165443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 41.

The square root of 666165443 is about 25810.1809951035. The cubic root of 666165443 is about 873.3614802452.

The spelling of 666165443 in words is "six hundred sixty-six million, one hundred sixty-five thousand, four hundred forty-three".