A single number, such as 38978567796588 does not constitute a progression.
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This is a geometric progression with a factor of -10, so 0.562.
Any number you like. You need two terms to uniquely identify an arithmetic progression.
one-million-billion is a sequence in the long scale: 1, 106, 1012. The next number in that progression would be 1 trillion which is 1018. Note that this is NOT the scale used by the US or UK.
If you mean: 12, 11, 9, 6, 2 then the next number is -3 Because they are being reduced by 1, 2, 3, 4 and then 5