Number 18

In neo-Nazi circles, number 18 is a code word for Adolf Hitler. The number comes from the position of the letters in the alphabet: A = 1 and H = 8.

"I'm Eighteen" is Alice Cooper's first Top Ten hit single, from the 1971 album called "Love It to Death".

The number of chapters into which James Joyce's epic novel Ulysses is divided.

Number 27

Many talented and famous rock/blues musicians died at the of age 27. These include Robert Johnson, Janis Joplin, Jimi Hendrix, Brian Jones, Jim Morrison, Pete Ham, and Kurt Cobain. The musicians who died at this age are often referred to as the 27 Club.

The number of species Captain Jean-Luc Picard made contact with in the series Star Trek: The Next Generation.

Abbé Faria's prisoner number in the book The Count of Monte Cristo.

Number 9

The number 9 is revered in Hinduism and considered a complete, perfected and divine number because it represents the end of a cycle in the decimal system, which originated from the Indian subcontinent as early as 3000 BC.

Nine Lives cat food: its name is derived from the legend that a cat has nine lives.

The nine muses in Greek mythology are Calliope (epic poetry), Clio (history), Erato (erotic poetry), Euterpe (lyric poetry), Melpomene (tragedy), Polyhymnia (song), Terpsichore (dance), Thalia (comedy), and Urania (astronomy).

Number 45

The sum of all single number digits is 45: 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45.

If you're married for 45 years, it is the sapphire wedding anniversary.

A football match consists of two periods of 45 minutes each.