After the man approached him, Mr. Wilmot said in an interview this week, their first steps included revising the man’s will to cover the windfall; forming trusts to educate his grandchildren and future heirs; paying for health care expenses; giving to charity; and lining up other specialist advisers.

Mr. Wilmot feared that if word leaked out about the man’s winnings, he could be in danger of a break-in at his home, so he moved him temporarily into a secure suite at a local hotel.

By the time Mr. Wilmot formally accepted the prize on behalf of the newly created L.L.C., the winner was able to enjoy the benefits of the prize without constant hassling from people who wanted money.

Instead, Mr. Wilmot, as the public face, absorbed all that on his client’s behalf.

“Every real estate broker is calling, every accounting firm is calling, all the tax folks, all the charities,” Mr. Wilmot said. The various pitches he received in the aftermath of the prize filled 22 boxes. Nine years later, he still receives requests for donations and other inquiries aimed at the winner.

In states where the winner’s name must eventually be made public in order to collect, building this protective barrier for business and charitable inquiries is doubly important; it can become overwhelming when winners handle it themselves, especially once people figure out their addresses.

Jason Kurland, a partner with the law firm Rivkin Radler who has represented numerous lottery winners, said that when they must appear publicly at a news conference, as some state lottery commissions insist, it is especially important to have already lined up good advisers and made major decisions.

That way, when the onslaught of solicitations begins, advisers are already in place to respond to them and the prize winner can maintain some measure of privacy.