The sum of the largest factor and the smallest multiple of a number is 26, what is the product of the largest factor and the smallest multiple.
一个数最大的因数与最小的倍数的和是26，它最大的因数与最小的倍数的积是多少．
<gadget id="calculator">26 / 2</gadget>
<output>13</output>

<gadget id="calculator">13 * 13</gadget>
<output>169</output>

<result>169</result>