Alright, let's work through 12999816 times 80089083 step by step
12999816 × 80089083 = 80089083 × (12999816)
+ 80089083 × 6 that is equal 480534498
+ 80089083 × 10 that equals 800890830
+ 80089083 × 800 which equals 64071266400
+ 80089083 × 9000 that results in 720801747000
+ 80089083 × 90000 that is equal 7208017470000
+ 80089083 × 900000 producing 72080174700000
+ 80089083 × 2000000 which equals 160178166000000
+ 80089083 × 10000000 that equals 800890830000000

= 1041143342608728
