It is hard to determine a person that has a number tied to their name, unless you know what the numbers stand for. The numbers 123456789 could be an id number for someone in the government or a persons id number in witness protection.
123456789 + 123456789 = 246913578
789456 to 123456789 789456 to 123456789 789456 to 123456789 789456 to 123456789
the answer is 15241578750190521
you get cheese
15,241,578,750,190,521
324536
543234567890-123456789 = 543111111101
1
123456789 + 36853168 = 160309957
123456789 +987654321 =1111111110
123456789 X 123456789 is1.52415788 × 1016
1234567 + 123456789 = 124691356