The number 5 goes into both 65 and 130 (65/5 = 13, 130/5 = 26)
2,4,6,8,12,16,24
1, 5, 13, 65.
Any non-zero number will go into 65 and 520 if you allow fractions.
13
The number is 1.
One.
One.
Itself and any other factors of 48
1 and 5
1 and 13.
The HCF is 5