505666 has 16 divisors (see below), whose sum is σ = 912960. Its totient is φ = 205200.

The previous prime is 505663. The next prime is 505669. The reversal of 505666 is 666505.

It is an interprime number because it is at equal distance from previous prime (505663) and next prime (505669).

It is not an unprimeable number, because it can be changed into a prime (505663) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 685 + ... + 1216.

It is an arithmetic number, because the mean of its divisors is an integer number (57060).

2⁵⁰⁵⁶⁶⁶ is an apocalyptic number.

505666 is a deficient number, since it is larger than the sum of its proper divisors (407294).

505666 is a wasteful number, since it uses less digits than its factorization.

505666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 505666 is about 711.1019617467. The cubic root of 505666 is about 79.6687343484.

The spelling of 505666 in words is "five hundred five thousand, six hundred sixty-six".