Properties of the Number 66421

Sixty-Six Thousand Four Hundred Twenty-One

Basics

Value: 66420 → 66421 → 66422

Parity: odd

Prime: No

Previous Prime: 66413

Next Prime: 66431

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 127 × 523

Divisors: 1, 127, 523, 66421

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10000001101110101

Octal: 201565

Duodecimal: 32531

Hexadecimal: 10375

Square: 4411749241

Square Root: 257.722719215827

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

Strong pseudoprimes to base 19. A20245

Squarefree numbers k such that for all factorizations of k as x·y, the sum (x·y') + (x' * y) is carryless when the addition is done in the primorial base, A049345. Here n' stands for A003415(n), the arithmetic derivative of n. A380525

a(n) = least k > 0 such that σ^k(n) + 1 is prime, if such k exists; otherwise 0, where σ^k denotes application of σ k times. A66421

Numbers n such that the result of n multiplied by the reversal of n can be split into two numbers a and b of equal length (if the length is odd a leading zero is allowed), where a + b equals n (b can also have a leading zero). A259316