Amazon's (NASDAQ:AMZN) stock rallied over 70% this year, making it the hottest stock in the FAANG cohort, which also includes Facebook, Apple, Netflix, and Alphabet (NASDAQ:GOOG) (NASDAQ:GOOGL).

Wall Street also remains overwhelmingly bullish on Amazon, with an average price target of more than $3,700 per share -- which is nearly 20% above its current price. Let's see why analysts still love Amazon, even after its valuation hit $1.6 trillion, and why its stock could still have room to run.

An Amazon Go store.

Image source: Amazon.

Amazon Web Services

Amazon's cloud unit AWS (Amazon Web Services) grew its revenue 31% year-over-year to $21 billion, or 13% of Amazon's top line, in the first half of 2020. That revenue growth was already robust, but AWS's operating profit surged 48% to $6.4 billion and accounted for 65% of Amazon's operating income.

That growth is impressive for two reasons. First, AWS is already the world's top cloud infrastructure platform with a 31% market share in the second quarter of 2020, according to Canalys, and its continued growth keeps it ahead of competitors like Microsoft's (NASDAQ:MSFT) Azure, Alphabet's Google Cloud, and Alibaba (NYSE:BABA) Cloud.

Second, most of AWS' competitors aren't profitable. Alibaba operates its cloud business at a loss, while many analysts believe Microsoft and Google, which don't disclose their cloud profits, are likely taking losses. AWS can consistently generate profits because it has a first-mover's advantage and superior scale.

AWS already serves massive customers like Facebook, Netflix, Twitter, Disney, and multiple government agencies. That well-established customer base and its expanding ecosystem should ensure AWS remains Amazon's core profit engine for the foreseeable future.

Amazon Prime

Amazon subsidizes the growth of its lower-margin North American unit and its unprofitable international unit with AWS' profits. That's the opposite of Alibaba's business model, which subsidizes the growth of its unprofitable cloud business with its higher-margin core commerce revenue.

An Amazon delivery driver.

Image source: Amazon.

AWS' profits enable Amazon to consistently sell its products at low prices while expanding its ecosystem with brick-and-mortar stores (including Whole Foods and Amazon Go), streaming media platforms, and cheap hardware devices. All those efforts strengthen Amazon Prime, which surpassed 150 million paid members globally at the end of 2019.

Amazon Prime's discounts, free shipping options, digital services, and other perks lock shoppers into its e-commerce ecosystem and prevent them from buying products from rival retailers. Therefore, Prime's growth buoys the long-term expansion of Amazon's online marketplaces, which still generate the lion's share of its revenue.

The pandemic is generating tailwinds instead of headwinds

Amazon's cloud and e-commerce businesses were already flourishing before the pandemic, but the crisis lit a fire under both businesses.

As more people stayed at home and worked remotely and accessed more online services, demand for AWS' services climbed across multiple industries. As brick-and-mortar stores shut down, shoppers bought more products from Amazon's e-commerce marketplaces.

Amazon initially warned that COVID-19 expenses would curb its earnings growth in the second quarter. But its revenue still rose 34% year over year in the first half of 2020, compared to 20% growth in 2019, and that accelerating revenue growth offset its higher expenses. As a result, Amazon's net income still grew by 26% as its EPS rose 24%.

Amazon expects its revenue to rise 24%-33% year-over-year in the third quarter. Analysts expect its revenue and earnings to rise 32% and 38%, respectively, for the full year. Those rosy estimates indicate Amazon remains a solid investment for both pandemic-stricken and post-pandemic markets.

It's still reasonably valued

Amazon trades at 58 times forward earnings. That valuation might seem frothy relative to other retailers, but it's a bargain compared to other high-growth cloud companies.

Moreover, Amazon's dominance of the cloud and e-commerce markets, the resilience of those businesses throughout the pandemic, and the ongoing expansion of its ecosystem all justify that slight premium. That's why Amazon will likely remain a top stock to own for long-term investors.