18 (eighteen) is the natural number following 17 and preceding 19.
In speech, the numbers 18 and 80 are sometimes confused. When carefully enunciated, they differ in which syllable is stressed: 18 /eɪtˈtiːn/ vs 80 /ˈeɪti/. However, in dates such as 1864, or when contrasting numbers in the teens, such as 17, 18, 19, the stress shifts to the first syllable: 18 /ˈeɪttiːn/. In some dialects, such as General American, there is little confusion because the single t sound in 80 becomes a d-like flap [ɾ], whereas the double t sound in 18 does not.
Eighteen is a composite number, its proper divisors being 1, 2, 3, 6 and 9. Three of these divisors (3, 6 and 9) add up to 18, hence 18 is a semiperfect number. Eighteen is the first inverted square-prime of the form p·q2.
It is a heptagonal number, and as the sum of the first three pentagonal numbers, it is a pentagonal pyramidal number. It is also the sum of the totient function for the first seven integers. It is the sixth lucas number.
Android 18 (Japanese: 人造人間18号, Hepburn: Jinzōningen Jū Hachi Gō, lit. "Artificial Human #18") is a fictional character in the Dragon Ball manga series created by Akira Toriyama. She and her brother, Android 17, were forcibly turned into cyborgs by Dr. Gero to serve his vendetta against Son Goku. The present-timeline version of the character has very little to no interest in fulfilling Gero's orders and becomes a supporting character in the series. In the alternate-timeline, Android 18 is a ruthless killer that has a reign of terror along with Android 17 over Earth that last for twenty years until they are destroyed by Trunks.
Android #18, along with Android #17, were conceived after Akira Toriyama's former editor Kazuhiko Torishima expressed disapproval with Androids #19 and #20 as villains. Following their introduction into the series, Torishima soon afterward became dissatisfied with her and #17 as well, resulting in the creation of Cell. Toriyama stated that he was pleased with Android #18 because she was a type of girl he had not drawn before, and that he liked her slanted eyes. In 2014, he revealed her real name was Lazuli (ラズリ, Razuri).
Verse 1: I became her lover, she became my lover. Had her heart broke, I was helping her recover. I became the man she knew she could rely on. Somebody to listen or shoulder to cry on. She was getting better, better she was getting. The more time spent, the more she would forget him. But then back around he seen that he started coming, and shes on the low taking phone calls from him. I thought that we were building something strong. He apologizes and now your gone. And I won't put up with this.
Pre-chorus: You wanna go. (Go.) Just hope you know. Baby your gonna be lonely, lonely again. Oh lonely, lonely. Go on go, go. Just hope you know. (Hey.) Baby your gonna be lonely, lonely again. Lonely, lonely again.
Chorus: Don't call me when your lonely again. When your lonely again, lonely again. Oh, sugga don't call me when your lonely again, when your lonely again. Lonely again. (Oh.)