英语数字的具体写法?例如：79,17456,568761,还有七位数.最好给我一个具体的总结!

seventy-nine
seventeen thousand four hundred and fifty six
five hundred and sixty-eight hundred thousand seven hundred and sixty-one
英语一般数字的写法会有"," 从右往左,第一个逗号读"thousand",第二个读"million",第三个读"billion",当中的三位数就是百位数的读法
例:111,111,111,111读成
one hundred and eleven (billion) one hundred and eleven (million) one hundred and eleven (thousand) one hundred and eleven