For a six-digit number, the number in the ones digit is 6, the number in the hundreds of thousands digit is 4, and the sum of any adjacent three digits is 15. What is the six-digit number?
一个六位数，个位上的数是6，十万位上的数是4，任意相邻的三个数位上的数的和都是15．这个六位数是多少．
<result>456_456</result>