No problem, we've got 80839376 and 78063046 to multiply
80839376 × 78063046 = 78063046 × (80839376)
+ 78063046 × 6 which equals 468378276
+ 78063046 × 70 yielding 5464413220
+ 78063046 × 300 resulting in 23418913800
+ 78063046 × 9000 what gives us 702567414000
+ 78063046 × 30000 producing 2341891380000
+ 78063046 × 800000 giving us 62450436800000
+ 78063046 × 0000000 yielding 0
+ 78063046 × 80000000 yielding 6245043680000000

= 6310567927299296
