No problem, we've got 99789191 and 79550015 to multiply
99789191 × 79550015 = 79550015 × (99789191)
+ 79550015 × 1 what gives us 79550015
+ 79550015 × 90 that is equal 7159501350
+ 79550015 × 100 which equals 7955001500
+ 79550015 × 9000 yielding 715950135000
+ 79550015 × 80000 yielding 6364001200000
+ 79550015 × 700000 producing 55685010500000
+ 79550015 × 9000000 which equals 715950135000000
+ 79550015 × 90000000 that results in 7159501350000000

= 7938231640887865
