Divide 625 by a number, the quotient is 16, and the remainder is the smallest single digit, what is this number?
625除以一个数，商是16，余数是最小的一位数，这个数是多少．
<gadget id="calculator">625 - 1</gadget>
<output>624</output>

<gadget id="calculator">624 / 16</gadget>
<output>39</output>

<result>39</result>