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Do you mean the Toyota Corolla?
https://en.wikipedia.org/wiki/List_of_best-selling_automobiles
I think if you consider model continuity, the Beetle is still the best-selling car. In recent decades, models like the VW Golf have been changed so much that they've really been many different cars, and the only thing that sold so much has been the name.
No idea which model has the greatest number surviving, though.
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Do you mean the Toyota Corolla?
That surprises me not one bit - every time I travel to an offbeat country, that car is pretty much ubiquitous. Drove one around Iraq for a couple of weeks (it seemed to be the only car you could hire), and in the Afghan mountains, you see nothing but NGO 4x4s and Corollas. Well, you mostly see nothing, but those are the only vehicles you occasionally see
Seems not, although with sales of 22 million since 1979 it's up there. Toyota Camry's at 40+ million though.