There should only be four numbers in the question: 3, 9, 81 and 6561. Then the fifth is 43046721.
108
3467910 is a single number: it is not a pattern!
Look at the difference between each number and the next number.
The next number is -21
The numbers are being squared: 32 = 9 92 = 81 812 = 6561 65612 = 43046721
There should only be four numbers in the question: 3, 9, 81 and 6561. Then the fifth is 43046721.
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!
73791170
8
243
25