I just gained 663214 souls

Hey everyone, I just wanted to say that I invaded a world while being in the forest hunter covenant and there were already two dudes fighting, the black phantom backstabbed the host 3 times and I received 663214 souls.
For the record I'm level 61 and to gain a level I need about 20000 souls... so yeah, that will probably be about 20 levels or so.
But for the sheer sake of discussion... what was the biggest number of souls you received at one time?
Cheers :)