The Number

661

Six Hundred and Sixty-One

In Base 19 Nonadecimal Is

1ff19

The numbers with a 19 subscript use Base 19 Nonadecimal notation.

For more familiar numbers: See Six Hundred and Sixty-One in Base 10 Decimal

Nearby Numbers

Positive, nonzero integers within three units

658
1fc19
Six Hundred and Fifty-Eight in Base 19 Nonadecimal
659
1fd19
Six Hundred and Fifty-Nine in Base 19 Nonadecimal
660
1fe19
Six Hundred and Sixty in Base 19 Nonadecimal
662
1fg19
Six Hundred and Sixty-Two in Base 19 Nonadecimal
663
1fh19
Six Hundred and Sixty-Three in Base 19 Nonadecimal
664
1fi19
Six Hundred and Sixty-Four in Base 19 Nonadecimal

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.

0.00a72if36h17e8g19

The reciprocal of 661 in Base 19 Nonadecimal.

Palindrome?

A numerical palindrome has the same value when all of its digits are reversed.

The number 1ff19 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 19 Nonadecimal

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 prime factors of a positive integer are the integers that divide it exactly and are also prime.

The number six hundred and sixty-one has the following 1 prime factor:

661
1ff19
Six Hundred and Sixty-One in Base 19 Nonadecimal

Prime Factorization

The prime factorization of a positive integer is the unique list of prime factors together with their multiplicities

1ff191 = 1ff19

Base Conversions

The number six hundred and sixty-one in 35 different bases