累乗
累乗された数を英語で読んでみましょう。（複数紹介しましたが、個人的には上にくるものの方がよく使われている気がします。）
82=64
Eight squared is sixty-four.
The square of eight is sixty-four.
63=216
Six cubed is two hundred sixteen.
The cube of six is two hundred sixteen.
54=625
The fourth power of five is six hundred twenty-five.
Five to the power of four is six hundred twenty-five.
Five to the fourth power is six hundred twenty-five.