A three-digit number, written on a piece of paper, is 1.5 times that of looking upside down, and looking upside down is 2/3. What is this three-digit number?
一个三位数，写在一张纸上，倒过来看是正着看的1.5倍，正着看是倒过来看的(2/3)．这个三位数是几？
<result>666</result>