Vietnamese prosecutors have told property tycoon Truong My Lan she must repay an estimated $11 billion if she wants to avoid execution by lethal injection.

Lan, 68, is appealing her death sentence after being convicted in April of embezzling $12.3 billion from Saigon Commercial Bank. She was also found guilty of bribing government officials and violating bank lending rules.

Prosecutors have so far argued against leniency at her hearing in Ho Chi Minh City unless she finds a way to return a significant chunk of the 415.7 trillion dong ($16.4 billion) she was found guilty of embezzling in two separate trials, according to her lawyer.