If you mean: 1 4 9 16 25 then it is 36
59 is the next number in this series.
One number does not make a sequence (nor a series).
243
The next number is 1112.
If you mean: 1 4 9 16 25 then it is 36
59 is the next number in this series.
1,4,9,16,25
The next number in the series is 67.
A single number such as 61205041320 does not make a series.
A single number, such as 12848384 does not make a series.
One number does not make a sequence (nor a series).
There is no series of number: just one very large number!
73791170
8
243
25