What is a vigintillion

A vigintillion equals 10^63 in the short scale system (American/modern international usage)—that's 1 followed by 63 zeros. In the long scale system (historical European usage), vigintillion equals 10^120. Given modern standardization, vigintillion typically refers to the short scale version with 63 zeros.

The name derives from Latin: "viginti" means twenty, as vigintillion is the 20th term in the naming sequence beyond million (million being the first). This number exists purely as mathematical abstraction with no practical applications in science, economics, or everyday measurement. Even the largest quantities in physics—like possible quantum states of complex systems or combinatorial possibilities—rarely require numbers this large, and when they do, scientists use scientific notation. These extreme number names follow a systematic Latin-based convention that can be extended indefinitely, but beyond perhaps quadrillion or quintillion, they serve more as linguistic curiosities than functional terminology for describing actual quantities anyone encounters or calculates.