There is a natural number, the sum of its largest two divisors is 153, what is this natural number?
有一个自然数，他的最大的两个约数之和是153，则这个自然数是多少．
<gadget id="calculator">3 * 17</gadget>
<output>51</output>

<gadget id="calculator">153 - 51</gadget>
<output>102</output>

<result>102</result>