UPDATE 2-Massive demand for Jackson memorial tickets

* Demand for tickets crashes server

* Los Angeles to Jackson fans: Stay home

* Memorial service, cost shrouded in mystery (Recasts lead with number of applicants; adds URL and deadline details; adds that event will be streamed online)

By Bob Tourtellotte

LOS ANGELES, July 3 (Reuters) - More than half a million fans from around the world applied for 17,500 free tickets to Michael Jackson's public memorial service next week, organizers said on Friday as a massive security operation got underway.

The life and music of the self-proclaimed "king of pop," who died of sudden cadiac arrest last Thursday, will be celebrated on Tuesday at the Staples Center, a basketball arena in downtown Los Angeles.

Officials on Friday unveiled an ambitious online lottery that will allow fans to attend either the televised service at the arena or watch the proceedings on a big screen at the nearby Nokia Theatre.

But within minutes, the staplescenter.com (www.staplescenter.com) server crashed. Officials warned additional disruptions were likely as fans logged on ahead of the Saturday deadline at 6 p.m. PDT (0100 GMT Sunday).

"You might want to consider watching this from the comfort of your own home," said Los Angeles City Councilwoman Jan Perry, who is doubling as the city's acting mayor.