To simplify the expression \((6^2 \cdot 6^5)^{-6}\), we first apply the property of exponents that allows us to combine the terms inside the parentheses:
\[ 6^2 \cdot 6^5 = 6^{2+5} = 6^7 \]
Next, we apply the exponent \(-6\) to the result:
\[ (6^7)^{-6} = 6^{7 \cdot -6} = 6^{-42} \]
Now, we can identify the equivalent expression from the given multiple-choice answers.
Thus, the answer is:
\[ 6^{-42} \]
So, the correct option is:
6, to the power minus 42 (−42).