6675
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 24
- Digital Root
- 6
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 12
- Divisor Sum
- 11160
- Proper Divisor Sum (Aliquot Sum)
- 4485
- Abundant Number
- no
- Perfect Number
- no
- Deficient Number
- yes
- Highly Composite
- no
- Weird Number
- no
- Untouchable Number
- no
- Primitive Abundant
- no
Derived Values
- Euler's Totient
- 3520
- Möbius Function
- 0
- Radical
- 1335
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 3
Special
- Factorial
- no
- Catalan Number
- no
- Bell Number
- no
- Motzkin Number
- no
- Primorial
- no
Figurate Numbers
- Fibonacci Number
- no
- Triangular Number
- no
- Perfect Square
- no
- Perfect Cube
- no
- Pentagonal Number
- no
- Hexagonal Number
- no
- Lucas Number
- no
- Tetrahedral Number
- no
- Pell Number
- no
- Tribonacci Number
- no
- Pronic Number
- no
Recreational
- Happy Number
- no
- Harshad Number
- no
- Narcissistic Number
- no
- Collatz Steps
- 67
- Smith Number
- no
- Vampire Number
- no
Primality
- Prime
- no
- Composite Number
- yes
- Semiprime
- no
- Squarefree Number
- no
- Prime Power
- no
- Prime Factorization
- no
- Twin Prime
- no
- Mersenne Prime
- no
- Sophie Germain Prime
- no
- Safe Prime
- no
- Powerful Number
- no
- Achilles Number
- no
- Perfect Power
- no
- Smooth Number
- no
- Carmichael Number
- no
Classification
- Even
- no
- Odd
- yes
Appears in sequences
- Coordination sequence T2 for Coesite.at n=43A008268
- Number of partitions of n with equal number of parts congruent to each of 0 and 2 (mod 4).at n=41A035541
- Numerators of continued fraction convergents to sqrt(519).at n=8A041992
- Numbers whose base-9 representation has exactly 5 runs.at n=21A043634
- Numbers m such that there are precisely 3 groups of order m.at n=33A055561
- a(2n) = concatenation of 4n+1 and 4n+2, a(2n+1) = concatenation of the two most nearly equal numbers whose product is a(2n).at n=25A068517
- Denominator of a(n), where for n > 2, a(n)=-1/a(n-1)+1/a(n-2), a(1)=1, a(2)=2.at n=7A074935
- Numbers n such that A002113(n) is a triangular number.at n=20A101034
- Numbers k such that the k-th semiprime == 7 (mod k).at n=4A106132
- Least k such that the difference between consecutive semiprimes A065516(k) equals n, or 0 if no such k exists.at n=26A123375
- Numbers k such that k and k^2 use only the digits 2, 4, 5, 6 and 7.at n=28A137094
- Beastly fax numbers: numbers containing the fax number of the Beast (667, one more than its regular number) in their decimal expansion.at n=12A138563
- Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (0, 1, 1), (1, 0, 1), (1, 1, -1), (1, 1, 1)}.at n=6A151234
- Composites that are the sum of two, three, four and five consecutive composite numbers.at n=6A151745
- 5 times pentagonal numbers: 5*n*(3*n-1)/2.at n=30A152734
- Partial sums of A049486.at n=21A174655
- Numbers n such that 41#*2^n-1 is prime, where # denotes the primorial, A002110.at n=64A176061
- Numbers n that (n^3 - 4,n^3 - 2) is a twin prime pair.at n=30A178507
- Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,1,1,1 for x=0,1,2,3,4.at n=7A197403
- T(n,k)=Number of nXk 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,0,1,1,1 for x=0,1,2,3,4.at n=37A197409