It is not possible to answer the question since a single number, such as 1266918, does not make a sequence. Also, there is no simple partitioning of the given number into a set of numbers which make up a straightforward sequence.
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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 next number in the series 1 2 4 8 10 20 22 is