To make the difference between the product of four consecutive natural numbers and 2011 the smallest, what is the four-digit number?
要使四个连续的自然数的积与2011相差最小，则这个四位数是多少．
<gadget id="calculator">5 * 6 * 7 * 8</gadget>
<output>1_680</output>

<result>1_680</result>