Alright, let's work through 99963648 times 81165480 step by step
99963648 × 81165480 = 81165480 × (99963648)
+ 81165480 × 8 what gives us 649323840
+ 81165480 × 40 producing 3246619200
+ 81165480 × 600 giving us 48699288000
+ 81165480 × 3000 which equals 243496440000
+ 81165480 × 60000 that is equal 4869928800000
+ 81165480 × 900000 that is equal 73048932000000
+ 81165480 × 9000000 what gives us 730489320000000
+ 81165480 × 90000000 resulting in 7304893200000000

= 8113597472471040
