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.
The number that comes after 11999 is 12000. This is the next whole number in the counting sequence, following the standard numerical progression.
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.