Bill Gates has topped the list of the world's richest billionaires for the 17th time. Having net worth of $75 billion, he is known for his generosity. He and his wife give away the biggest share of their earnings via Bill & Melinda Gates Foundation.

Amancio Oretga, Zara founder, is currently the second richest man in the world. He started his business from scratch. When he was a teenager, he started working as an apprentice in the dressing saloon and after some time started his own apparel retail store. In addition to the world-famous Zara brand, Inditex has other clothing retail brands.

The friend of Bill Gates, Warren Buffet, has been ranked as the world's third wealthiest person. Net worth of the founder of Berkshire Hathaway is estimated at $60.8 billion. He is widely considered one of the greatest investors. Economists and businessmen around the world follow his tips of investing.

Carlos Slim Helu, the owner of Mexican telecommunications corporation America Movil and The New York Times shareholder, is now the fourth-richest man in the world. His net worth is $50 billion, dropped by $27.1 billion in a year because of the Mexican peso's devaluation. Carlos Slim is a famous philanthropist financing the country's educational, medical and cultural projects.

Amazon founder Jeff Bezos is ranked fifth-rich billionaire on Earth. His net worth increased by $10.4 over a year. He gets his fortune from Blue Origin, Amazon, and The Washington Post.

The youngest billionaire, Mark Zuckerberg with $44.6 billion, landed in the sixth spot of the richest billionaires list after having a good year that added $11.2 billion to his net worth. The businessman invests in successful projects. Thus, he acquired the maker of the Oculus Rift, a virtual reality headset.

Larry Ellison, the seventh richest person in the world, made his money in the software industry. He founded the Oracle Corporation. Last year Mr. Ellison stepped down as CEO of the company, but continued overseeing Oracle's development. Oracle is gearing up to battle its most successful rival Amazon supplying cloud computing services.

Michael Bloomberg, the founder, CEO, and owner of Bloomberg L.P., the global financial data and media company, is the eighth wealthiest person in the world. His fortune is estimated at $40 billion. Bloomberg was Mayor of the City of New York from 2003 through 2013.

The Koch brothers, Charles and David stand ninth and tenth on the list with the total net worth of $80 billion.

Pictured: 80-year-old Charles Koch

Pictured: 75-year-old David Koch