No problem, we've got 86378755 and 80813876 to multiply
86378755 × 80813876 = 80813876 × (86378755)
+ 80813876 × 5 that equals 404069380
+ 80813876 × 50 producing 4040693800
+ 80813876 × 700 giving us 56569713200
+ 80813876 × 8000 which equals 646511008000
+ 80813876 × 70000 resulting in 5656971320000
+ 80813876 × 300000 that equals 24244162800000
+ 80813876 × 6000000 that results in 484883256000000
+ 80813876 × 80000000 resulting in 6465110080000000

= 6980601995604380
