516665 has 4 divisors (see below), whose sum is σ = 620004. Its totient is φ = 413328.

The previous prime is 516653. The next prime is 516673. The reversal of 516665 is 566615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 346921 + 169744 = 589^2 + 412^2 .

It is a cyclic number.

It is not a de Polignac number, because 516665 - 2¹² = 512569 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 516665.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51662 + ... + 51671.

It is an arithmetic number, because the mean of its divisors is an integer number (155001).

2⁵¹⁶⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

516665 is a deficient number, since it is larger than the sum of its proper divisors (103339).

516665 is a wasteful number, since it uses less digits than its factorization.

516665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103338.

The product of its digits is 5400, while the sum is 29.

The square root of 516665 is about 718.7941290801. The cubic root of 516665 is about 80.2422345400.

Subtracting from 516665 its sum of digits (29), we obtain a triangular number (516636 = T₁₀₁₆).

It can be divided in two parts, 5166 and 65, that multiplied together give a triangular number (335790 = T₈₁₉).

The spelling of 516665 in words is "five hundred sixteen thousand, six hundred sixty-five".