123456789*123456789=123456789×100000000+123456789×20000000+123456789×3000000+123456789×400000+123456789×50000+123456789×6000+123456789×700+123456789×80+123456789×9
=12345678900000000+2469135780000000+370370367000000+49382715600000+6172839450000+740740734000+86419752300+9876543120+1111111101
=15,241,578,750,190,500
123456789*123456789