Definition of "quintillion"

quintillion

/kwɪnˈtɪljən/

numeral
plural quintillions
1. (US, modern British & Australian, short scale) A billion billion: 1 followed by eighteen zeros, 1018.
  Quotations
  Last week, we used […] the BBC News website's biggest number: 9,223,372,036,854,775,808, that's 9.2 quintillion […] [the maximum video viewer count on YouTube's] updated counter software.
  2014, “Small Data: Those big numbers keep on coming”, in BBC News Magazine Monitor‎, BBC
  You are currently logged on to the largest version of the internet that has ever existed. By clicking and scrolling, you’re one of the 5 billion–plus people contributing to an unfathomable array of networked information—quintillions of bytes produced each day.
  2023 December 18, Charlie Warzel, “Nobody Knows What’s Happening Online Anymore”, in The Atlantic‎
2. (dated, Britain, Australia, long scale) A million quadrillion: 1 followed by 30 zeros, 1030.
noun
plural quintillions
1. (figuratively, slang, hyperbolic) Any very large number, exceeding normal description.