The last three numbers of Mingming’s phone number are the same, and the sum is 18; the first number is 2 more than the last number; among the other four numbers, the last number is twice the previous number, what is Mingming’s phone number?
明明家电话的后三个数字一样，和是18；首位数比末尾数多2；其他四个数字中，后一个数字都是前一个数字的2倍，明明家的电话号码是多少呢？
<result>81_248_666</result>