Simplify the expression $\displaystyle\frac{{{{\left({16}\right)}}^{{6}}\cdot{{4}}^{{-{{5}}}}}}{{{4}}^{{3}}}\usepackage{cmbright}\Huge\$ , expressing the answer as a power of 4.

To write the exponent $\displaystyle{{a}}^{{b}}\usepackage{cmbright}\Huge\$ , use the following notation: a^b.