To check whether it is an arithmetic sequence, verify whether the difference between two consecutive numbers is always the same.
To check whether it is a geometric sequence, verify whether the ratio between two consecutive numbers is always the same.
9, 81, 6561, 43046721, ...This would be the sequence 9^(2^(n-1))
65613 = 6561 x 6561 x 6561 = 282429536481
6561 = 6561.0 or 6561 = 6561/1
6561
6561^3 = 282,429,536,481.
Any multiple of that number: 6561 x 0 6561 x 1 6561 x 2 etc.
They are: 729*9 = 6561
The square root of 6561 is 81.
6561 and a power of -8 = 6553
square of 6561 is 43046721 square root is 81
6058
It is 6561.