quintillion
number /kwɪnˈtɪljən/
/kwɪnˈtɪljən/
- the number 1018, or 1 followed by 18 zeros
五百亿：数字1018，或1后跟18个零 词源late 17th cent.: from French, from million, by substitution of the prefix quinti- ‘five’ (from Latin quintus ‘fifth’) for the initial letters.