Mingming’s phone number is a seven-digit number, the number in the million digit is 6, the digit in the ten thousand digit is 8, and the sum of any adjacent three digits is exactly 18. Please guess Mingming's phone number.
明明家的电话号码是一个七位数，百万位上的数字是6，万位上是8，任意相邻的三个数字的和刚好是18．请你猜出明明家的电话号码．
<result>6_485_475</result>