No problem, we've got 80717651 and 8026052 to multiply
80717651 × 8026052 = 8026052 × (80717651)
+ 8026052 × 1 that results in 8026052
+ 8026052 × 50 what gives us 401302600
+ 8026052 × 600 producing 4815631200
+ 8026052 × 7000 yielding 56182364000
+ 8026052 × 10000 resulting in 80260520000
+ 8026052 × 700000 yielding 5618236400000
+ 8026052 × 0000000 producing 0
+ 8026052 × 80000000 yielding 642084160000000

= 647844064243852
