Anybody interested in America’s greatest river should read Mark Twain’s books. In the given sentence anybody is indefinite pronoun.
Pronouns with an ambiguous subject or object are known as indefinite pronouns. They are referred to as "indefinite" merely because they do not specify the precise thing, person, or location that they are referring to.
All indefinite pronouns with a final -one are singular. Anybody, everyone, someone, and one are some of these words.
All indefinite pronouns with the suffix "-body" are singular.
Both, few, many, others, and several are always plural indefinite pronouns.
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