Evaluate $[7\mathrm{.}66{10}^6{]}^{2}mm$ to three significant figures and express your answer in SI units using and apropriate prefix.

Express your answer to three significant figures and include the appropriate units.

$[7\mathrm{.}66{10}^6{]}^{2}mm=5\mathrm{.}87*{10}^{10}$

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Your answer contains correct dimensions of distance, but you need to use the appropriate SI unit or prefix for the unit. No credit lost. Try again.

Please HELP NO MATTER WHAT I PUT ITS WRONG