Prince Fahd al-Saud booked entire areas of the park over May 22 to 24 for his 60-odd guests, who included friends, as well as diehard Disney fans and bloggers.
Special security was put in place for the prince, one of the park's top customers, it added.
The Paris event was the grand finale of a world tour entirely at the expense of the Saudi royal called Disney Dreamers Everywhere, which started in Hong Kong Disneyland and moved onto theme parks in Tokyo, California, Florida and then France.
The festivities included tailor-made events involving "rare Disney characters," Euro Disney said.
According to regional newspaper Ouest France, the prince even had a hand in designing the costumes and the scenarios – all specially shipped in for the event, along with 80 dancers.
"Rare" characters making special guest appearances included Roger and Jessica Rabbit, the Aristocats and the cast of Up and Atlantis, the Lost Empire.
"This is the first time there has been such a grandiose, private world tour, said Julien Guedon, editor of Disney Gazette, whose correspondent was on the Paris guest list.
"The prince had fun. He was there all along, but we are not allowed to speak about him, that was the order," he told the Daily Telegraph.
Only true Disney aficionados could have kept up with the programme, as guests were roused at 6am to be taken down the park's Main Street, specially transformed into a typical Parisian street, and the fun ended at 2am every night.
"The prince had the park to himself early morning and after the official closing time at 11pm," said Mr Guedon. The rest of the time, it was open to normal visitors, invited to meet some of the characters he had shipped in.
This is not the first time the prince has forked out for a private event. Last year he reportedly spent 800,000 euros on a private event for a small group of friends to mark the 20th anniversary of the park.
Despite the lavish festivities, Ouest France said actors and dancers received "normal fees despite night-time rehearsals and the demands of the (special) guest".
Disneyland Paris attracted 16 million visitors last year – twice the number who scaled the Eiffel Tower – but Euro Disney has failed to make profits since it was set up 20 years ago.
The prince's multi-million month of fun was a welcome boost, but is unlikely to push the group into the black. For the first half of this year, its net loss amounted to 108.4 million euros compared to 120.9 million euros for the prior-year period.
Prince Fahd is the son of the late Saudi Crown Prince Nayef bin Abdul-Aziz al Saud and his third wife, Maha bint Mohammed bin Ahmad Al Sudairi.
In March, a French court had his mother's assets seized after she fled Paris's luxury Shangri-La hotel in the middle of the night to avoid paying a £5 million hotel bill.