do you know what the largest black hole is that has ever been discovered?

Question: do you know what the largest black hole is that has ever been discovered?
- Keywords:
  black hole,
  large,
  size
Asked by anon-353925 to Vicky on 23 Mar 2023. This question was also asked by anon-361993.
- Vicky Fawcett answered on 23 Mar 2023: last edited 23 Mar 2023 11:47 am
  
  The black hole called Ton 618 which is 66 billion times more massive than our sun!
  This is called a “supermassive black hole” or “ultra massive black hole”

Question: do you know what the largest black hole is that has ever been discovered?