Bezos, who also owns The Washington Post newspaper, is the first person to cross the $100 billion mark in assets, Forbes said.
Egyptian businessman Mohamed Mansour was ranked third in Egypt and 887th internationally with a total value of $2.7 billion, followed by Yassin Mansour, who was ranked fourth in Egypt and 1,284th globally, with a fortune of $1.9 billion.
Premji moved up from the 72nd global spot in 2017 with $14.9 billion, to the 58th rank with $18.8 billion this year. He is richer by $16.9 billion in 2018 with assets of $40.1 billion.
US President Donald Trump fell by 222 positions to rank 766th, with $3.1 billion, $400 million less than when he entered the White House.
On February 9, 2018, Forbes indicated that the wealth of Amazon's innovative, excellence-driven chief executive officer stood at $112 billion.
Mukesh Ambani, the energy and petrochemicals magnate, kept his standing as the richest Indian.
The Forbes World's Billionaires list includes 2,208 people from all over the world whose fortunes are calculated to be at least $1 billion.
32 billionaires in the following video are the richest women in their countries, with the youngest being listed first.
Forbes" 2018 "billionaires list' features numerous same names as past year, as well as one newcomer, a new frontrunner and fatter wallets all round.
In some cases siblings and couples are listed together if the ownership breakdown among them isn't clear, however they still must be worth on average a minimum of US$1 billion apiece to make the cut.
According to Forbes" 2018 "World's Billionaires' list, Reliance Industries Chairman Mukesh Ambani's wealth surged a whopping 72.84 per cent to United States dollars 40.1 billion (Rs 2,60,622 crore) - highest among the 119 Indian Billionaires on the list.
Many people of the Indian diaspora also figure on the Forbes list.
Meanwhile, grabbing the top slot is Amazon founder Jeff Bezos, who beat Bill Gates to become the richest human being. Peruvian 93-year-old Ana Maria Brescia Cafferata came in as the eldest on the list.
Known for his financial prudence despite his vast fortune, Buffet co-founded the Giving Pledge in 2010 with Bill and Melinda Gates, wherein billionaires promise to give away the majority of their money to worthy causes.
According to Forbes, India is home to 119 billionaires, 18 more than past year.