text: Album sales
  3.1 million: Teenage Dream 
  1.74 million: PRISM 
  1.73 million: One of the Boys 
  311,000: Witness 
  63,000: MTV Unplugged EP 
  Most-streamed songs, on-demand
  1.2 billion: Dark Horse 
  904 million: Roar
  526 million: Firework
  509 million: Con Calma 
  481 million: Last Friday Night 
  401 million: E.T. 
  399 million: Feels 
  394 million: Hot N Cold
  388 million: California Gurls 
  323 million: Swish Swish 
  Best-selling songs
  7.4 million: Firework
  6.6 million: Roar
  6.4 million: Dark Horse
  6 million: E.T.
  5.9 million: California Gurls
  5.8 million, Hot N Cold
  5 million, Teenage Dream
  4.8 million, I Kissed a Girl
  3.8 million, Last Friday Night 
  3.5 million, Wide Awake
  Most-heard songs on radio
  6.8 billion: Firework
  6.6 billion: Dark Horse
  6.3 million: Teenage Dream
  6.2 billion: Hot N Cold
  6 billion: Roar
  5.3 billion: California Gurls
  4.3 billion: E.T.
  3.8 billion: Wide Awake
  3.6 billion: Last Friday Night 
  3.2 billion: The One That Got Away