AN-225 - it's BIG!
As stated on the website, that machine has flown since 1988. Where have you been all this time.
The "factoids" are more a collection of rumour and supposition. Yes, there was thought of using Mriya as a first-stage booster-but for HOTOL, never Buran (Buran unlike the STS did not have its own rocket engines, and neither had large fuel tanks, hence the large external tank.)
Comparing jet engines to HP outputs...really...
Annnnd...747-Fs DO have nose loading...