[tex]\dfrac{9^3 \times {3}^{15}}{3^5} =\dfrac{9^3\times\backslash\!\!\!3^{15}}{\backslash\!\!\!3^5}=9^3 \times 3^{15-5} =9^3\times 3^{10} =(3^2)^3\times3^{10}[/tex]

[tex]3^6 \times 3^{10}=3^{6+10} =3^{16}=43046271[/tex]