Properties of the Number 66661

Sixty-Six Thousand Six Hundred Sixty-One

Basics

Value: 66660 → 66661 → 66662

Parity: odd

Prime: No

Previous Prime: 66653

Next Prime: 66683

Digit Sum: 25

Digital Root: 7

Palindrome: No

Factorization: 7 × 89 × 107

Divisors: 1, 7, 89, 107, 623, 749, 9523, 66661

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000010001100101

Octal: 202145

Duodecimal: 326B1

Hexadecimal: 10465

Square: 4443688921

Square Root: 258.1879160611511

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

Fourth powers (n·n * n·n) in carryless arithmetic mod 10. A169886

G.f.: (1 + x³ + x⁴ + ... + x¹² + x¹⁵)/∏_i=1..10 (1 - xⁱ). A3403

Number of rooted identity trees with n nodes and 3 leaves. A55328

Numbers having four 6's in base 10. A43516

Berend Jan van der Zwaag's conjectured complete list of numbers that start different "expanding periodic loops" under the mapping described in A053392 and A060630. A103117

a(n) = (6·10ⁿ - 51)/9 for n > 0. A173805

Number of partitions of n with rank 3 or higher (the rank of a partition is the largest part minus the number of parts). A363230

Primes of the form 60·R_k + 1, where R_k is the repunit (A002275) of length k. A92571

Numbers k such that 60·R_k + 1 is prime, where R_k = 11...1 is the repunit (A002275) of length k. A56658

Digits of the 10-adic integer (-17/3)^1/3. A309640