670 - 6016900 = -6,016,230.
I think it's supposed to be 676 million 16 thousand 9 hundred, not subtracting:
676,016,900
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Sixteen million, eight hundred thousand, nine.
16,405,016
16,800,009 = sixteen million, eight hundred thousand and nine
16,530,000 sixteen million, five hundred and thirty thousand
16,500,000 or 16.5 million