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Are there any equivalent numbers which can be written in Hindu-Arabic numerals for numbers used in Pali
I found one here by Googling for "pali numerals": Pali Numbers - Ancient Buddhist Texts
This is a list of commonly found Pāḷi numbers which occur in the literature.
What is the time period mentioned in ‘‘Sataṃ sahassānaṃ nirabbudānaṃ, Chattiṃsatīṃ pañca ca abbudāni"
The reference I cited above says,
1 + 63 zeros: nirabbutaṁ
Ven. Sugato's translation of that sutta says,
For more than two quinquadecillion years,
Sataṃ sahassānaṃ nirabbudānaṃ,and another five quattuordecillion years,
Chattiṃsatī pañca ca abbudāni;
I don't know if those are the same numbers; I can't count that high in English!