Farid el-Deeb also told CNN in an interview that Mubarak denied charges of graft and killing protesters during the uprising that ousted him in February.
“He was very sad and sorry because he did not imagine such accusations,” Deeb said.
“His entire fortune amounts to around 6 million Egyptian pounds which he saved from working for 62 years. He does not own anything else in Egypt or outside of Egypt.
“He does not own a single dollar abroad.”
Deeb said Mubarak needed help to go to the bathroom in the hospital in the Red Sea resort of Sharm el-Sheikh where he is detained.
“The president has serious heart problems,” Deeb said. “He does not watch TV or anything else. They ban him from doing so to avoid more psychological pain.”
“He speaks very little and suppresses a lot of his feelings.”
Mubarak was ordered last week to stand trial for killing protesters and for corruption and wasting public funds.
More than 840 people were killed during 18 days of protests that toppled Mubarak. Twenty-six policemen were also killed.
Mubarak and two former officials was fined 540 million pounds by a court on Saturday for cutting mobile and Internet services during the protests.