16
16 is a perfect square (4²) and a power of two (2⁴) — a single hexadecimal digit's full range.
Where 16 fits
Why 16 is special
16 sits at the intersection of pure mathematics (square and binary power) and everyday life: it is a common age-of-milestone number ("sweet sixteen") in several English-speaking cultures, and 2⁴ underlies hexadecimal notation in computing.
Not just a mathematical number
16is also used in ways where ordinary arithmetic doesn't apply — each listed below with what genuinely does and doesn't follow from it.
- Mathematical number
A genuine quantity — its mathematical properties (prime, square, factors, and so on) are real facts about it.
A genuine quantity that ordinary arithmetic applies to — it can be prime, even, a perfect square, added to another number meaningfully, and so on.
- Measurement
Also used as a measurement — Processor and software bit-widths.
A quantity expressed against a defined unit or standard (24 hours in a day, 60 seconds in a minute) — arithmetic is meaningful, but the specific value is a fixed convention of the measuring system, not a discovered mathematical property.
16 in Numbers Around Us
16 is part of
Factors & digit properties
- Divisors (5)
- 1, 2, 4, 8, 16
- Prime factorisation
- 2^4
- Digit sum
- 7
- Digital root
- 7
Representations
- Decimal
- 16
- Binary
- 10000
- Octal
- 20
- Hexadecimal
- 10
- Roman numeral
- XVI
- Scientific notation
- 1.600 × 10^1
Other mathematical patterns
- Deficient number
- Powerful number
Related numbers & connections
16 is a factor of 32 (16 × 2 = 32).
View 32 →Hexadecimal notation is base 16 — each digit represents a value from 0 to 15.
16-bit was a common early personal-computer processor width, and remains standard for CD-quality (16-bit) linear PCM audio.
Mathematically related
- is a factor of32
why?
Strength 0.50, confidence "high".
Numbers Around Us
- appears inHexadecimal colour notation
why?
Strength 0.50, confidence "high".
- appears inFilm gauge
why?
Strength 0.50, confidence "high".
Other connections
- is associated withProcessor and software bit-widths
why?
Strength 0.50, confidence "high".
Culture
"Sweet sixteen" is a documented US/UK coming-of-age birthday milestone tradition, distinct from any single legal age of majority.
Widely documentedCultureGeography: United States, United Kingdom
Common questions
Is 16 a prime number?
No, 16 is not prime.
What are the factors of 16?
The factors of 16 are 1, 2, 4, 8, 16.
What is 16 in Roman numerals?
16 in Roman numerals is XVI.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026