55
Everything about the number 55 — its names, how to write it in other bases and numeral systems, and what makes it interesting mathematically.
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Names of 55
| Nominal | 55 |
| Cardinal | fifty-five |
| Ordinal | 55th |
| This number as US currency | fifty-five dollars |
Properties (and some facts) of 55
| Is 55 an odd number? | 55 is an odd number |
| Is 55 an even number? | 55 is not an even number |
| Is 55 a palindrome? | 55 is a palindrome |
| Is 55 a triangle number? | 55 is a triangle number |
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55 in other bases
| Base 2 (Binary) | 110111 |
| Base 3 (Ternary) | 2001 |
| Base 4 (Quaternary) | 313 |
| Base 5 (Quinary) | 210 |
| Base 6 (Senary) | 131 |
| Base 8 (Octal) | 67 |
| Base 12 (Duodecimal) | 47 |
| Base 16 (Hexadecimal) | 37 |
| Base 20 (Vigesimal) | 2F |
Primes and factors tests for 55
| Is 55 a prime number? | 55 is not a prime number |
| Is 55 a perfect number? | 55 is not a perfect number |
| Is 55 a Mersenne prime? | 55 is not a Mersenne prime |
| Is 55 a Fermat prime? | 55 is not a Fermat prime |
| Is 55 a Fibonacci prime? | 55 is not a Fibonacci prime |
| Is 55 a partition prime? | 55 is not a partition prime |
| Is 55 a Pell prime? | 55 is not a Pell prime |
| Prime Factors | Prime factors of 55 |
55 in other numeral systems
| 55 in Roman numerals | LV |
| 55 in Chinese numerals | 伍拾伍 |
| 55 in Babylonian numerals |  |
| 55 in Egyptian numerals | 𓎊𓏾 |
Roots and squares for 55
| Is 55 a square number? | 55 is not a square number |
| Is 55 a cube number? | 55 is not a cube number |
| Square root of 55 | 7.4161984870957 |
| Cube root of 55 | 3.8029524607614 |
Recreational math for 55
| Number 55 reversed | 55 |
| Sum of the digits | 10 |
| Number of digits | 2 |
Arithmetic tables for 55
Other pages about 55
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