Sexagintillion is the short-scale name for 10 to the power of 183, one of a long chain of -illion names that keep growing long after everyday numbers run out. Because the word itself is so long and unfamiliar, it has become a handy piece of internet humour for exaggeration, appearing in maths jokes, counting clips and edits that push a quantity past any normal limit. The clip works precisely because listeners recognise the pattern of million, billion and trillion, then hear it stretched to a ridiculous extreme.