25,565
Port 25565 is the default port for a Minecraft server.
- Odd
- Composite
Where 25,565 fits
Why 25,565 is special
It is probably the port number most widely known to people who have never configured a server for any other reason. A generation learned port forwarding, dynamic DNS and firewall rules in order to let friends join a game, which is a genuine if accidental route into networking.
Factors & digit properties
- Divisors (4)
- 1, 5, 5113, 25565
- Prime factorisation
- 5 × 5113
- Digit sum
- 23
- Digital root
- 5
Representations
- Decimal
- 25565
- Scientific notation
- 2.557 × 10^4
Roman numerals
Roman numerals as modelled here goes up to 3,999.
Binary
1 1 0 0 0 1 1 1 1 0 1 1 1 0 1
1 × 16,384 + 1 × 8,192 + 0 × 4,096 + 0 × 2,048 + 0 × 1,024 + 1 × 512 + 1 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 25,565
Octal
6 1 7 3 5
6 × 4,096 + 1 × 512 + 7 × 64 + 3 × 8 + 5 × 1 = 25,565
Hexadecimal
6 3 d d
6 × 4,096 + 3 × 256 + d × 16 + d × 1 = 25,565
Read as powers of two: 16,384 + 8,192 + 512 + 256 + 128 + 64 + 16 + 8 + 4 + 1 = 25,565.
In historical numeral systems
Egyptian
2 fingers, 5 lotuses, 5 coils of rope, 6 hobbles, 5 strokes
2 × 10,000 + 5 × 1,000 + 5 × 100 + 6 × 10 + 5 × 1 = 25,565. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Semiprime
Related numbers & connections
Two game server defaults that between them taught a generation about port forwarding and NAT, which no networking course managed at the same scale.
View 27015 →Numbers Around Us
- appears alongside27015
why?
Strength 0.50, confidence "high".
Technology & computing
25565 is plausibly the port number most familiar to people who have never run any other kind of server. Port forwarding, dynamic DNS and firewall rules were learned by a great many people purely so that friends could join a Minecraft world.
DocumentedTechnology & computing
Common questions
Is 25,565 a prime number?
No, 25,565 is not prime.
What are the factors of 25,565?
The factors of 25,565 are 1, 5, 5113, 25565.
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