Is the word quinhentos the same in Brazilian and European Portuguese?

Yes

The word "quinhentos" is identical in spelling, meaning, and grammar in both Brazilian and Continental Portuguese. The only difference is pronunciation:

• In Brazil: The "s" at the end of the word is typically pronounced as a soft "s" (as in "sun"), and the vowels are generally more open and clear.
• In Portugal: The "s" at the end is often pronounced as a "sh" sound (as in "shoe"), and the vowels tend to be more "closed" or reduced.

Brazilian Portuguese Examples

1. Eu tenho quinhentos reais na carteira. (I have five hundred reais in my wallet.)
2. Ele comprou quinhentos livros para a biblioteca. (He bought five hundred books for the library.)
3. O trajeto tem quinhentos metros de extensão. (The route is five hundred meters long.)
4. Há quinhentos anos que essa floresta existe. (This forest has existed for five hundred years.)
5. O prédio possui quinhentos apartamentos. (The building has five hundred apartments.)

Continental Portuguese Examples

1. Eu tenho quinhentos euros na carteira. (I have five hundred euros in my wallet.)
2. Ele comprou quinhentos livros para a biblioteca. (He bought five hundred books for the library.)
3. O trajeto tem quinhentos metros de extensão. (The route is five hundred meters long.)
4. Há quinhentos anos que essa floresta existe. (This forest has existed for five hundred years.)
5. O prédio possui quinhentos apartamentos. (The building has five hundred apartments.)