I can't think of one thing I want to own that much.

I think I'd do best to steal a supply of that mega expensive drug that the Norwegians used to partly or completely cure a small number of people diagnosed with CFS (though not everybody gained the benefit).

Or, I suppose, enough money in (say) Swiss francs (a currency unlikely to collapse soon) to pay for treatment with whatever the drug is, or whatever variant may be better. Actually, why not say I'd steal enough to pay for a research program to find a solution? A lot of people would be pleased if that happened.