The Messerschmitt 264/6M **wasn't a real bomber that was in Luftwaffe**. This was a long range bomber that was suppose to replace the Junkers Ju 390 (Long Range Bomber) that also had six engines. But the Me 264/6M (or simply the Me 364) was suppose to perform better than the Ju 390 as it held more bombs and it can fly in longer distances.
**Do keep in mind, the Me364 isn't a real bomber. This design also doesn't approve the original blueprint.**
source: https://www.deviantart.com/haryopanji/art/Messerschmitt-Me-264-6M-Me-364-868716005