Nothing difficult about making this decision. With that sum of money.....and only a week to live, there would be nothing for me to "spend" it on, except perhaps to pre-pay my funeral expenses.
I'd divide by 4.....visit each of my sons and their families.....present them with a final gift, tell them I trust them to invest WISELY.....and request that maybe.....they think of Mom, now and then and remember how very much I adore them all. I'd remind them to follow the "Pay it Forward," attitude, in which I strongly believe. Pretty simple.