septendecillion /ˌsɛptəndəˈsɪl.i.ən/ number2 •(US, rare) 10⁵⁴.STV by the Numbers: [...] 3000^16 (roughly 43 septendecillion) : number of possible voting permutations if 3,000 students vote (Single Transferable Voting is pretty complicated!). — 2003 •(old-fashioned, rare) 10¹⁰². formsseptendecillions