$\because 6\times \dfrac{1}{6}=1$，

$\therefore 6$的倒数是$\dfrac{1}{6}$.

故答案为$\dfrac{1}{6}$.

$\because 6\times \dfrac{1}{6}=1$，

$\therefore 6$的倒数是$\dfrac{1}{6}$.

故答案为$\dfrac{1}{6}$.