Suppose you win 100 million. What do you actually do with it? Banks only guarantee 250,000. Do you have to invest it? Is there anywhere you can just let it sit and draw interest?
The real answeris, get in contact with the accountants of other people who have 100mil and have them take care of it. I'd probably squirrel away some in precious metals just in case. Also, I would not post a single thing on the Internet about the fact that I'm rich.