Answer
$$15.6 \times 10^{-18}. $$
Work Step by Step
We simplify the numerator and denominator by adding the exponents and multiplying the like terms and then by subtracting the exponents and dividing the like terms, as follows:
$$\frac{ (5.15\times 10^{9} )(65.3\times 10^{-6} )}{(27\times 10^{6} )(800\times 10^{12} )}=\frac{ (5.15 )(65.3 )\times 10^{9-6}}{(27 )(800)\times 10^{6+12} }
\\=\frac{336.295\times 10^{3}}{21600\times 10^{18} }=\frac{336.295}{21600 }\times 10^{3-18}\\ =0.0156\times 10^{-15}=15.6 \times 10^{-18}. $$
