65.
2+1*3=5
5+2*3=11
11+3*3=20
20+4*3=32
32+5*3=47
47+6*3=65
59 is the next number in this series.
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!
8
243
20
25
73791170
108