For a nine-digit number, the digit of tens of millions is 5, the digit of one hundred thousand is 6, and the sum of the numbers in every adjacent three digits is 16. What is the nine-digit number?
一个九位数，千万位上是5，十万位是6，每相邻三个数位上的数字之和是16，这个九位数是多少．
<result>655_655_655</result>