"To be" is an unconjugated form and the conjugated forms of the same verb are for example: is, are, was, were, have been, etc.
The most common uses of the infinitive are for example:
To indicate the purpose or intention of an action (where the 'to' has the same meaning as 'in order to' or 'so as to'):
She is planning to become a scientist in the future.
As the subject of the sentence:
To be or not to be, that is the question.
To be with her is to love her.
With nouns or pronouns, to indicate what something can be used for, or what is to be done with it:
Would you like something to be changed in your new room?
After adjectives in these patterns:
It is + adjective +to-infinitive
It is good to be together again.It is + adjective + infinitive + for someone + to-infinitive.
It is hard for mice to be brave like lions.
After an adjective + noun when a comment or judgement is being made:
It is a good idea to be careful in new situations.
With too and enough in these patterns:
too much/many (+ noun) + to-infinitive
There's too much sugar to put in this bowl.
I had too many books to carry.
too + adjective + to-infinitive
This soup is too hot to eat.
She was too tired to work.
too + adverb + to-infinitive
He arrived too late to be noticed by other guests.
adjective + enough + to-infinitive
She's old enough to be financially independent.
not enough (+noun) + to-infinitive
There aren't enough resources to be used.
not + adjective + enough + to-infinitive
You're not old enough to be a grandfather!
As to the sentence you have posted, "It is said to be..." is a special structure. "It is said that," "He is said to (+infinitive) ," and sometimes "(be) supposed to (+ infinitive)" have the meaning "people say..." and they are often used in news reports.
i.e. An old lady in my town died last week, and people say that she gave a lot of money to charity.
It is said that she gave a lot of money to charity.
She is said to have given a lot of money to charity.
She is supposed to have given a lot of money to charity.
