59 is the next number in this series.
43
One number does not make a sequence (nor a series).
243
The next number is 1112.
59 is the next number in this series.
The next number in the series is 67.
43
A single number such as 61205041320 does not make a series.
A single number, such as 12848384 does not make a series.
The next number is 4. There is a sequence:Add 3, subtract 2, repeat
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