According to Google's "How Search Works" is reporting the web is made of 130 trillion pages, however, it doesn't specifically say 130 trillion are indexed. It also indicates that the index is over 100 million gigabytes.
What's interesting, in this simplistic diagram is the line which follows through Site and page quality, freshness, safesearch (for obvious reasons), user content, and it continues to refer to "over 200 factors." It then goes on through translation, and universal search.
Google says it's supporting more than 100 billion searches each month.
[
google.com...]