"千的五次方" can be translated into English as "the fifth power of one thousand" or more concisely as "one thousand to the fifth power".
In mathematical notation, it is written as \(1000^5\) or \(10^3^5\) (though the latter is less common and typically simplified to \(10^{15}\) for clarity, representing a trillion in the short scale used in many English-speaking countries).
For everyday communication, "one thousand to the fifth power" is the most straightforward and commonly understood expression.