nonillion

nonidentity 不同一性 nonillion 一百萬的九次方 nonillionth 10的54次冪 ^[1] 

柯林斯英漢雙解大詞典

nonillion /nəʊˈnɪljən/

N (in Britain, France, and Germany) the number represented as one followed by 54 zeros (1054) (在英國、法國和德國)百萬的9次方 ^[1]