The Number
661
Six Hundred and Sixty-One
In Base 18 Octodecimal Is
20d18
The numbers with a 18 subscript use Base 18 Octodecimal notation.
For more familiar numbers: See Six Hundred and Sixty-One in Base 10 Decimal
Nearby Numbers
Positive, nonzero integers within three units
Scientific Notation
Scientific notation expresses a quantity as the product of its significand with 10 raised to an integer exponent.
6.61e2
Reciprocal
A number multiplied with its reciprocal is one.
0.008eebcdfhd1dfa18
The reciprocal of 661 in Base 18 Octodecimal.
Palindrome?
A numerical palindrome has the same value when all of its digits are reversed.
The number 20d18 is not a palindrome.
A Prime Number
A prime number is a positive integer that is divisible only by itself and one.
Six hundred and sixty-one is the 121st prime number. See primes in Base 18 Octodecimal
Not A Composite
Composites have more than just these two factors.
Six Hundred and Sixty-One is not a composite number because it has exactly two factors: One and Six Hundred and Sixty-One
Prime Factors
The number six hundred and sixty-one has the following 1 prime factor:
Prime Factorization
The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities
20d181
= 20d18
Base Conversions
The number six hundred and sixty-one in 35 different bases