To express -1066 as a mixed number, we start by recognizing that a mixed number consists of a whole number and a proper fraction.
Since -1066 is a negative whole number, we can write it as:
\[ -1066 = -1066 \frac{0}{1} \]
This shows -1066 as a mixed number, where the whole part is -1066 and the fractional part is 0 over 1.
If you want to represent -1066 differently, such as identifying it as a negative mixed number with a positive format, it would simply remain as:
\[ -1066 \]
As mixed numbers typically refer to positive values, the simplest form of the mixed number representation of -1066 is: \[ -1066 \frac{0}{1} \]