To simplify the expression \(\frac{13^{18}}{13^{6}}\), you can use the property of exponents that states:
\[ \frac{a^m}{a^n} = a^{m-n} \]
In this case, we have \(a = 13\), \(m = 18\), and \(n = 6\).
Applying the property:
\[ \frac{13^{18}}{13^{6}} = 13^{18 - 6} = 13^{12} \]
Thus, the simplified answer in exponential form is:
\[ \boxed{13^{12}} \]