6655
domain: N
Properties
Digital Properties
- Digit Count
- 4
- Digit Sum
- 22
- Digital Root
- 4
- Palindromic Number
- no
- Repdigit
- no
- Automorphic
- no
- Kaprekar Number
- no
- Multiplicative Persistence
- 2
Divisibility
- Divisor Count
- 8
- Divisor Sum
- 8784
- Proper Divisor Sum (Aliquot Sum)
- 2129
- 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
- 4840
- Möbius Function
- 0
- Radical
- 55
- Omega Function (Ω)
- 4
- Little Omega Function (ω)
- 2
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
- 168
- 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
- Numbers of the form 5^i * 11^j.at n=14A003598
- Number of permutations of (1,...,n) having n-6 inversions (n>=6).at n=6A005284
- Number of nonseparable toroidal tree-rooted maps with n + 2 edges and n + 1 vertices.at n=9A006414
- Number of 3-voter voting schemes with n linearly ranked choices.at n=19A007009
- Numbers k that divide s(k), where s(1)=1, s(j)=5*s(j-1)+j.at n=6A014852
- Numbers k that divide s(k), where s(1)=1, s(j)=15*s(j-1)+j.at n=35A014865
- Numbers k that divide the (right) concatenation of all numbers <= k written in base 11 (most significant digit on left).at n=29A029456
- Composite numbers whose prime factors contain no digits other than 1 and 5.at n=15A036305
- Numbers whose prime factors are in {5, 7, 11}.at n=34A036490
- Transformation of A036490: 5^a*7^b*11^c -> 5^a*7^floor((b+2)/2)*11^c.at n=34A036491
- Sums of 11 distinct powers of 2.at n=23A038462
- Numbers having three 7's in base 8.at n=32A043451
- Numbers having three 1's in base 9.at n=37A043459
- Numbers whose base-4 representation contains exactly two 1's and four 3's.at n=30A045123
- Numbers k that divide 3^k + 2^k.at n=11A045576
- Numbers k that divide 7^k + 3^k.at n=21A045586
- Numbers k that divide 6^k + 4^k.at n=30A045591
- Odd numbers with exactly 4 palindromic prime factors (counted with multiplicity).at n=40A046374
- Numbers k such that k | 10^k + 9^k + 8^k + 7^k + 6^k + 5^k + 4^k + 3^k + 2^k + 1^k.at n=17A056739
- Numbers n such that n | 12^n + 11^n + 10^n + 9^n + 8^n.at n=31A057250