In the above image, one number is missing. Can you find the missing number. It is an interesting number puzzle. Hope you will like it.

The missing number is 4
Explanation:
First circle: (5,25)=2 as 5^2=25 similarly (2,16)=4 as 2^4=16
the number inside the circle=2^(2+4)=64
second circle: (3,81)=4 as 3^4=81 similarly (8,64)=2 as 8^2=64
the number in the circle=2^(4+2)=64
third circle: (7,343)=3 as 7^3=343 simirly (4,64)=3 as 4^3=64
the number in th circle=2^(3+3)=64

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