- here is an idea for a captcha

- write this number in words

- 486436546497964136564768756456455824164567575646875812445676854253154782125

- four quadrigintilion eight hundred sixty four trigintillion three hundred sixty five duovigintillion four hundred sixty four unvigintillion nine hundred seventy nine vigintillion six hundred forty one novemdecillion three hundred sixty five octodecillion six hundred forty seven septendecillion six hundred eight seven sexdecillion five hundred sixty four quindecillion five hundred sixty four quatuordecillion five hundred fifty eight tredecillion two hundred forty one duodecillion six hundred forty five undecillion six hundred seventy five decillion seven hundred fifty six nonillion four hundred sixty eight octillion seven hundred fifty eight septillion one hundred twenty four sextillion four hundred fifty six quintillion seven hundred sixty eight quadrillion five hundred forty two trillion five hundred thirty one billion five hundred forty seven million eight two thousand one hundred twenty five