Write each place value from the word form as digits, then combine.<br><br>
&bull; Thousands: Eighty-one thousand = 81 × 1 000 = 81000<br>
&bull; Hundreds: five hundred = 500<br>
&bull; Tens and ones: sixty-four = 64<br>
&bull; Combine: 81000 + 500 + 64 = 81564<br>
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Final Answer: 81564