Not sure how many of those are flying around but one was in Bangor a few months ago. They fly into Bangor quite often, takes most of the 2 mile runway to get off the ground
Only 1 was ever built, meaning it’s more likely that you saw an AN-124 (4 engines rather than 6), but if you really did get to see it, that’s very cool. Even the -124 has more cargo capacity than a C-5 (our largest transport), and the -225 can carry almost 50% more than a -124. Insane.