What plane has the most engines on it?

antonov 225, B-47 XB-70 Me-323 - 6 jet engines, last has props

B-52- 8 jets

B-36, 6 rear facing props plus four jets on late models

The Me-323Z had 9 piston engines. 3 banks of three. 3 on the left wing, 3 on the right wing, and the on the center wing which was between the two fuselages.

the Do-X had 12 piston engines grouped in a push/pull configuration in 6 nacelles above the wing.

the B-36 had 6 piston engines and 4 jet engines.

The "HeliOS HP01" and "Centurion" are both unmanned solar flying wings with 14 electric motors each.