1. One quintillion (10^18)

Encyclopedia: Exa-

• neuropile
• neuroplasty
• neuropsychiatric
• neuropsychiatry
• neuropsychological
• neuropsychology
• Neuroptera
• neuropteran
• neuropteron
• neuropterous insect
• neurosarcoma
• neuroscience
• neuroscientist
• neurosis
• Neurospora
• neurosurgeon
• neurosurgery
• neurosyphilis
• neurotic
• neurotic depression
• neurotically
• neuroticism
• neurotoxic
• neurotoxin
• neurotransmitter