The Situation is now a number.

Mike Sorrentino of MTV’s “Jersey Shore" fame is No. 66910-050 in the Federal Bureau of Prisons registry, and Tuesday was the day he surrendered to begin an eight-month sentence in federal prison for participating in a scheme to dodge taxes.

His brother Marc Sorrentino, 39, was given a two-year prison term with one year of supervised release.

Mike, who lives in Long Branch, is going to serve his sentence at Otisville Federal Correctional Institution in Otisville, New York, according to a post on his verified Facebook page.

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Mike made time for social media Tuesday morning with a note and video on Instagram.

"I made a special YouTube video today that will be up in the next few days," said Sorrentino, sporting a "Free Sitch" T-shirt, which went on sale in November. "See you guys on the other side #FreeSitch."

Fellow castmembers Nicole “Snooki” Polizzi and Jennifer "JWoww" Farley posted words of support in reply by noon.

The Sorrentino brothers of Manalapan were arrested and charged in 2014 with multiple tax offenses related to nearly $9 million in income. Mike pleaded guiltily in January to one count of evading taxes on about $123,000 in income in 2011 and Marc admitted to helping prepare a fraudulent tax return.

Mike Sorrentino’s legal problems have intersected with his attempt to remain sober, and both have played out in the public since “Jersey Shore” ended its run in 2012. He’s been drug free for three years, after being dependent on opioids since college, he said to the Asbury Park Press in June.

He opened up about the two issues on “Reunion Road Trip: Return to the Jersey Shore” on E! in August of 2017. The one-time special preceded the “Jersey Shore” sequel, “Jersey Shore Family Vacation,” which began on MTV in April of 2018.

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“On a serious note, in the next six months, the court case is about to come to a close,” said Sorrentino on “Reunion road Trip.” “I believe it’s going to be resolved positively but at the same time, if I never saw y’all for 10 years or something, it kind of puts things in perspective. Sometimes things are not said that should be said. I’m clean 18 months and I’m just really happy to be seeing everybody.”

“I love you guys.”

On Season 2 of “Jersey Shore Family Vacation,” which aired from August to December in ‘18, Sorrentino focused on his wedding to Lauren Pesce, finding the best buffet and “living my best life.”

His rosy outlook belied the fact that the season was filmed in July and August, before Sorrentino was to be sentenced to eight months in prison for tax evasion on Oct. 5. He was given 30 to 60 days to report at the time, but that was later extended until Jan. 15.

Yet, his battle to remain sober was the topic of a poignant episode on Nov. 8 when he and fellow castmate Farley visited the Discovery Institute in Marlboro, where the Sorrentino previously spent six months in rehab.

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Sorrentino spoke frankly about his battle with addiction on the episode. He also spoke to Anthony, a patient at Discovery.

“I watched you guys on the show and watching your show blew me away because I grew up in Seaside Heights,” Anthony said. “I know all the owners of the clubs, free drinks — my ego was bigger than this building.”

The original run of MTV’s “Jersey Shore” took place primarily in Seaside Heights from 2009 to 2012.

“Anthony’s story is similar to mine,” the Situation said. “He lived by the Shore, he partied by the Shore. Those partying ways led to a dependency, or an addiction.

“But there’s light at the end of the tunnel.”

While nightly escapades on “Jersey Shore Family Vacation” often included plenty of boozing, Sorrentino did not partake.

Sorrentino’s legal situation might be part of a storyline for the upcoming Season 3 of “Jersey Shore Family Vacation.” The cast attended the Oct. 5 sentencing in Newark with a film crew in tow, according to reports.

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Sorrentino will have to serve two years of supervised release after the prison sentence is completed. He also must serve 500 hours of community service and he’s paid a $10,000 fine and $123,000 in restitution.

“Today I’m a man I should have been years ago,” he said to the judge at the Oct. 5 sentencing. “I was inexperienced, uneducated and immature to handle everything that came with overnight success.”

Chris Jordan: cjordan@app.com. Twitter: @chrisfhjordan