Well, it depends on which comic universes or specific story arcs you're looking at. In some, there has been a female counterpart or variation of the Silver Surfer. But it's not a constant presence across all comic runs.
Not typically. The Silver Surfer is traditionally a male character. However, in the vast and diverse world of comics, there could be alternate realities or special storylines where a female version exists, but it's not a mainstream aspect.
In certain comic universes or alternate story arcs, there have indeed been female characters associated with the Silver Surfer concept. These characters might have similar powers or play related roles.
The Silver Surfer is obviously one of the main characters. There might also be other characters from the Marvel universe that he interacts with, but without further research, it's hard to say exactly who else.
The main character is obviously the Silver Surfer himself. But other characters often include Galactus, who he serves. Also, the Fantastic Four might make appearances as they have had many interactions with the Silver Surfer.
One of the best is 'The Silver Surfer: Parable'. It's a beautifully illustrated story that delves deep into the Surfer's moral and philosophical struggles. It shows his journey of self - discovery and his relationship with Galactus in a very profound way.
It's hard to give an exact number as new comics are constantly being produced and older ones might be re-released or collected in different volumes. But there are definitely a significant number of Silver Surfer comics out there.