Properties of the Number 2665

Two Thousand Six Hundred Sixty-Five

Basics

Value: 2664 → 2665 → 2666

Parity: odd

Prime: No

Previous Prime: 2663

Next Prime: 2671

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 × 13 × 41

Divisors: 1, 5, 13, 41, 65, 205, 533, 2665

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101001101001

Octal: 5151

Duodecimal: 1661

Hexadecimal: a69

Square: 7102225

Square Root: 51.62363799656123

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

Centered square numbers: a(n) = 2·n*(n+1)+1. Sums of two consecutive squares. Also, consider all Pythagorean triples (X, Y, Z=Y+1) ordered by increasing Z; then sequence gives Z values. A1844

a(n) = number of partitions of n into parts of 2 kinds. A712

Pseudoprimes to base 3. A5935

Numbers whose base-2 representation is the juxtaposition of two identical strings. A20330

a(n) = n*(3·n + 7)/2. A140090

Numbers m that are the hypotenuse of exactly 13 distinct integer-sided right triangles, i.e., m² can be written as a sum of two squares in 13 ways. A97102

Composite numbers such that the square mean of their prime factors is a nonprime integer (where the prime factors are taken with multiplicity and the square mean of c and d is sqrt((c²+d²)/2)). A134602

Nonprimes k such that 3^k == 3 (mod k). A122780

Least hypotenuse of primitive Pythagorean triangles with odd leg 2n+1. A96891

a(n) = 8·n² + 4·n + 1. A102083