Properties of the Number 660

Six Hundred Sixty

Basics

Value: 659 → 660 → 661

Parity: even

Prime: No

Previous Prime: 659

Next Prime: 661

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 5 × 11

Divisors: 1, 2, 3, 4, 5, 6, 10, 11, 12, 15

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1010010100

Octal: 1224

Duodecimal: 470

Hexadecimal: 294

Square: 435600

Square Root: 25.69046515733026

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

Average of twin prime pairs. A14574

a(n) = ∑_k=1..n k·floor(n/k); also ∑_k=1..n σ(k) where σ(n) = sum of divisors of n (A000203). A24916

Numbers having k prime factors (counted with multiplicity), the largest of which is the k-th prime. A106529

a(n) = n*φ(n). A2618

Numbers that are products of 5 primes (or 5-almost primes, a generalization of semiprimes). A14614

Highly abundant numbers: numbers k such that σ(k) > σ(m) for all m < k. A2093

Exponential Riordan array (1, x·cosh(x)). A185951

Numbers divisible by the product of their prime indices. A324850

Number of partitions of n into parts >= 3. A8483

Numbers n such that n = product (p_k)^c_k and set of its (c_k k's)'s is a self-conjugate partition, where p_k is k-th prime and c_k > 0. A88902