Forbes' 2016 list of the World's Billionaires includes 1,810 billionaires, down from a record 1,826 a year ago. Their aggregate net worth is USD 6.5 billion, USD 570 million less than last year.

Gates remains the richest person in the world with a net worth of USD 75 billion, despite being USD 4.2 billion poorer than a year ago. He has been number one for 3 years in a row and topped the list 17 out of 22 years.

Forbes said Ambani, 58, has retained his position as India's richest person despite shares of his oil and gas giant Reliance Industries taking a hit due to lower oil prices.

He is ranked 36th on the list with a net worth of USD 20.6 billion, the magazine said, adding that "the USD 62.2 billion (revenues) firm is likely to resume buying crude oil from Iran after the lifting of sanctions."

Occupying the second spot on the list is Spanish billionaire Amancio Ortega, founder of closing retail giant Zara and the richest man in Europe. On the third spot is billionaire philanthropist and Berkshire Hathaway CEO Warren Buffett, Mexican billionaire Carlos Slim Helu (4) and Amazon CEO Jeff Bezos (5).

Ambani leads a pack of 84 billionaires from India, with pharma magnate Dilip Shanghvi (rank 44 and USD 16.7 billion networth), Wipro Chairman Azim Premji (55 with USD 15 billion networth) and HCL co-founder Shiv Nadar (88 and USD 11.1 billion networth) coming in among the top 100 billionaires.

Other prominent Indian billionaires include ArcelorMittal Chairman Lakshmi Mittal (135), Bharti Airtel’s Sunil Mittal (219), Ports and power magnate Gautam Adani (453), matriarch Savitri Jindal (453), Bajaj Group’s Rahul Bajaj (722), Infosys chairman emeritus N R Narayana Murthy (959) and Mahindra Group’s Chief Anand Mahindra (1577).

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