What does it mean when the interviewer only asks you a few questions and leaves you with a lot of time to ask them questions?

If the interviewer doesn't pose any difficult or penetrating questions, you probably won't be given any thought for the position.

If the interviewer doesn't pose any difficult or penetrating questions, you probably won't be given any thought for the position. Salary wasn't mentioned at all, or it didn't seem to be a problem.
signs your interview failed
The interview went more quickly than anticipated.
The interviewer appeared uninterested or preoccupied.
You stumbled on a crucial inquiry.
The number of panel lists was lower than anticipated.
The interviewer provided insufficient details regarding the job.
The interviewer didn't do much to promote the business.