Properties of the Number -65

Sixty-Five

Basics

Value: -66 → -65 → -64

Parity: odd

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 5 × 13

Divisors: 1, 5, 13, 65

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -1000001

Octal: -101

Duodecimal: -55

Hexadecimal: -41

Square: 4225

Square Root: 8.06225774829855

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

Generalized sum of divisors function: excess of sum of odd divisors of n over sum of even divisors of n. A2129

a(n) = (n+1)*(2-n)/2. A80956

Rank of the n-th region of the set of partitions of j, if 1<=n<=A000041(j). A194447

a(n) = n*(-1)ⁿ. A38608

Values of n such that L(9) and N(9) are both prime, where L(k) = (n²+n+1)*2^2·k + (2·n+1)*2^k + 1, N(k) = (n²+n+1)*2^k + n. A226929

a(n) = -n. A1489

Square array A(n,k), n >= 1, k >= 0, read by antidiagonals: A(n,k) = ∑_d∣n (-1)^n/d+d*d^k. A322083

Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is expansion of ∏_j>=1 (1-x^j)^{j^k} in power of x. A283272

Let f(a,q) = ∏_j>=0 (1 - a·q^j); g.f. is f(q²,q³) / f(q,q³). A111317

Reversal of n in balanced ternary representation. A134028