How big a black hole could the whole universe make? Is that relevant ca. Big Bang?

Factual Questions
1

If all the mass in the universe were located densely enough in one area, how big a black hole would it make?

Around the Big Bang, when all the mass in the universe was all close together, would it make sense to talk about it making a black hole? Or would the conditions at that time, including the extremely high energies, the expansion of space itself from a (near?) singularity, and the fact that the forces did not exist as we now know them make that not an issue? If there was a universal black hole around the time of the Big Bang, is it at all relevant to the life of the universe since then?

2

This is kind of interesting. The universe would make a black hole approximately (and i mean really approximately) the size of the current universe! Really huge black holes get away with being very low in density. So it’s conceivable that we’re inside a black hole. This is not really the same kind of black hole that a stellar collapse may result in, but it still has an escape speed greater than c.