Alright, let's work through 18237149 times 81656316 step by step
18237149 × 81656316 = 81656316 × (18237149)
+ 81656316 × 9 resulting in 734906844
+ 81656316 × 40 yielding 3266252640
+ 81656316 × 100 yielding 8165631600
+ 81656316 × 7000 that equals 571594212000
+ 81656316 × 30000 producing 2449689480000
+ 81656316 × 200000 which equals 16331263200000
+ 81656316 × 8000000 giving us 653250528000000
+ 81656316 × 10000000 what gives us 816563160000000

= 1489178401683084
