Properties of the Number -7665

Six Hundred Sixty-Five

Basics

Value: -7666 → -7665 → -7664

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 3 × 5 × 7 × 73

Divisors: 1, 3, 5, 7, 15, 21, 35, 73, 105, 219

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -1110111110001

Octal: -16761

Duodecimal: -4529

Hexadecimal: -1df1

Square: 58752225

Square Root: 87.54998572244315

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

a(n) = - ∑_d∣n (-n/d)^d * binomial(d+n/d-2, d-1). A338688

Number of partitions of 2n in which every part is <n+1; also, the number of partitions of 2 into rational numbers a/b such that 0<a<=b<=n and b divides n. A209816

The non-repetitive Kaprekar binary numbers in decimal. A163205

Number of partitions of n with no part larger than n/2. Also partitions of n into n/2 or fewer parts. A110618

a(0) = 0; a(n) is obtained by incrementing each digit of a(n-1) by 1. A61511

Number of integer partitions of n whose greatest part is at most one more than the sum of the other parts. A336106

Numbers k for which nontrivial positive magic squares of exactly 8 different orders with magic sum k exist. For a definition of nontrivial positive magic squares, see A125005. A125015

Number of polygon edges formed when every pair of vertices of a regular n-gon are joined by an infinite line. A344899

T(n,k) = 24·A046802(n,k) - 9·A008518(n,k) - 8·A007318(n,k), triangle read by rows (0 <= k <= n). A168292

Odd squarefree numbers n such that the cyclotomic polynomial φ(n,x) has height 4. A152942