Alright, let's work through 64161312 times 88140097 step by step
64161312 × 88140097 = 88140097 × (64161312)
+ 88140097 × 2 what gives us 176280194
+ 88140097 × 10 which equals 881400970
+ 88140097 × 300 producing 26442029100
+ 88140097 × 1000 what gives us 88140097000
+ 88140097 × 60000 yielding 5288405820000
+ 88140097 × 100000 what gives us 8814009700000
+ 88140097 × 4000000 that is equal 352560388000000
+ 88140097 × 60000000 resulting in 5288405820000000

= 5655184263327264
