I know that the Queen owns Australia. I live in it as an Australian Citizen.

I suppose if you evaluate these territories by time in centuries you might get to a quadrillion. The Queen's wealth is a pill that's a bit easier to swallow, although 20 quadrillion is a huge stretch. The Vatican is harder, since their land holdings are not of the same scale and there aren't a billion churches, but if you measure their wealth in time I suppose you could reach a quadrillion.

The problem is the Vatican's "Quintillions", and specifically in Gold that's ready to liquidate. That breaks many rules in economics and physics and is too big a stretch to accept so readily without inducing hyperinflation. The physics part is the mass of that gold. Divide $1 quintillion by maybe $2000 per ounce (a high price of gold in USD), and you get 500 trillion ounces. Where could they store that much gold, how did they get that gold, and how the hell would they be able to move it out?