sexagintillion

Latin had a perfectly ordinary word for sixty: sexāgintā, a neat numerical building block that later found itself recruited into the extravagant English -illion parade. The suffix -illion belongs to the same family of number names as million and billion, allowing English to keep marching upward long after everyday counting has become useless. By the twentieth century, systematic naming schemes could label the sixtieth member of that series as sexagintillion—an architectural feat of vocabulary more than a number anyone expects to write out. An Urban Dictionary example jokes that even YouTube has fewer videos than one, which is probably the safest practical use of the word. Remember the image: Latin supplies “sixty,” English supplies an endless staircase, and sexagintillion is the sign at stair number sixty.