Is That A Big Number?

If Mass of Janus (moon of Saturn) (1.9 quintillion kg) was a standard unit ...

Mass of the largest asteroid (Ceres) (939 quintillion kg)...more would be 500 x Mass of Janus (moon of Saturn)

Mass of Mimas (moon of Saturn) (37.5 quintillion kg)...more would be 20 x Mass of Janus (moon of Saturn)

Mass of water in Lake Tanganyika (Africa) (18.9 quadrillion kg)...more would be 1/100 of Mass of Janus (moon of Saturn)

Yes, there's now a book based on these numbers. Oxford University Press: July 2018.