No problem, we've got 81018852 and 10737349 to multiply
81018852 × 10737349 = 10737349 × (81018852)
+ 10737349 × 2 resulting in 21474698
+ 10737349 × 50 resulting in 536867450
+ 10737349 × 800 which equals 8589879200
+ 10737349 × 8000 what gives us 85898792000
+ 10737349 × 10000 that equals 107373490000
+ 10737349 × 000000 what gives us 0
+ 10737349 × 1000000 giving us 10737349000000
+ 10737349 × 80000000 that equals 858987920000000

= 869927689503348
