No problem, we've got 84664815 and 6667784 to multiply
84664815 × 6667784 = 6667784 × (84664815)
+ 6667784 × 5 what gives us 33338920
+ 6667784 × 10 resulting in 66677840
+ 6667784 × 800 what gives us 5334227200
+ 6667784 × 4000 what gives us 26671136000
+ 6667784 × 60000 resulting in 400067040000
+ 6667784 × 600000 yielding 4000670400000
+ 6667784 × 4000000 yielding 26671136000000
+ 6667784 × 80000000 that results in 533422720000000

= 564526698819960
