I'd split it. Not necessarily 50/50.
We have one state lottery here. If you win, you will get some profession help about what to do with that money. One thing they say is: go spend some of it. Just buy that thing you've always wanted to buy but never could (naturally, that depends a bit on what you won). The rest you can sensibly invest in some way.
If I would win a decent amount of money, not a huge amount, but enough to make one ponder, I'd get that car I've been wanting ever since I knew it came out. It's not a huge car, but a hybrid version of a model I've loved from the first time I've seen it. I would also let the driveway be done (there's a water tank that needs to be removed underneath it) and maybe let the lawn be equalized. The rest I'd put away, in such a way that the government will get the least amount
