No problem, we've got 80817675 and 65026307 to multiply
80817675 × 65026307 = 65026307 × (80817675)
+ 65026307 × 5 yielding 325131535
+ 65026307 × 70 which equals 4551841490
+ 65026307 × 600 that equals 39015784200
+ 65026307 × 7000 that results in 455184149000
+ 65026307 × 10000 yielding 650263070000
+ 65026307 × 800000 what gives us 52021045600000
+ 65026307 × 0000000 yielding 0
+ 65026307 × 80000000 which equals 5202104560000000

= 5255274945576225
