昔の bsd unix 系だと number ってコマンドがあって「那由多」くらいまでなら英語化(アメリカ式)してくれる。(Linux系だと bsd-games とかあたりのパッケージに入っているかもしれない)
$ number 39994792359253394001702275013763631290701843632375482136520802682
thirty-nine vigintillion.
nine hundred ninety-four novemdecillion.
seven hundred ninety-two octodecillion.
three hundred fifty-nine septendecillion.
two hundred fifty-three sexdecillion.
three hundred ninety-four quindecillion.
one quattuordecillion.
seven hundred two tredecillion.
two hundred seventy-five duodecillion.
thirteen undecillion.
seven hundred sixty-three decillion.
six hundred thirty-one nonillion.
two hundred ninety octillion.
seven hundred one septillion.
eight hundred forty-three sextillion.
six hundred thirty-two quintillion.
three hundred seventy-five quadrillion.
four hundred eighty-two trillion.
one hundred thirty-six billion.
five hundred twenty million.
eight hundred two thousand.
six hundred eighty-two.