You have $5 million and are thinking of putting it in a bank? Ya right....
If you are actually serious and not just a troll the FDIC insures each account up to $250,000 or something like that. So dont put more than that in one account.
Why dont you talk to some good investment brokers and say you have a million to invest. See what they say.
Might want to talk to a good tax adviser too. Limit your liabilities.
Most of the people on Wickedfire's plan for 5 mill would involve a Ferrari, Lamborghini, and a MB.
Not sure why you are asking here.
Diversify. Hedge against disaster like the Chinese finally pulling everything out of dollars.