The next number is 9. The sequence is - starting with the 1st digit, you add 2 each time. Starting at the 2nd digit, each number is a square. Therefore the next two numbers would be 9 (7+2) and 25 (5x5)
25
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
it is 31818 - 8 = 1010 - 4 = 66 - 2 = 44 - 1 = 3
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
20
8
243
25
108