US: a number equal to 1 followed by 24 zeros see Table of Numbers
also, British: a number equal to 1 followed by 42 zeros see Table of Numbers
Example Sentences
Recent Examples on the WebAuthorities say the match Parabon Labs identified had a 1 in 65 septillion odds of being inaccurate. Grace Kahng, ABC News, 16 Sep. 2021 By comparison, the pressure inside a neutron star is in the septillions of gigapascals, so these liquid cases likely occur in nature around the universe. Caroline Delbert, Popular Mechanics, 9 Dec. 2019 The number of possible routes adds up to around 15 septillion (trillion trillion), according to Goldman Sachs, an investment bank.The Economist, 28 Mar. 2018
Word History
Etymology
French, from Latin septem + French -illion (as in million) — more at seven