The mass of the Sun is 1.989 × 10³⁰ kilograms, which is equivalent to 4.385 × 10³⁰ pounds.

It's difficult to express this number directly in tons because tons can refer to different units:

* Metric tons: 1 metric ton = 1000 kilograms. Therefore, the Sun's mass is 1.989 × 10²⁷ metric tons.

* US short tons: 1 US short ton = 2000 pounds. Therefore, the Sun's mass is 2.193 × 10³⁰ US short tons.

It's important to specify which type of ton you're using when discussing such large numbers.