505665566 has 16 divisors (see below), whose sum is σ = 867179520. Its totient is φ = 216632760.

The previous prime is 505665481. The next prime is 505665607. The reversal of 505665566 is 665566505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46475 + ... + 56313.

It is an arithmetic number, because the mean of its divisors is an integer number (54198720).

Almost surely, 2^505665566 is an apocalyptic number.

505665566 is a deficient number, since it is larger than the sum of its proper divisors (361513954).

505665566 is a wasteful number, since it uses less digits than its factorization.

505665566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13519.

The product of its (nonzero) digits is 810000, while the sum is 44.

The square root of 505665566 is about 22487.0088273207. The cubic root of 505665566 is about 796.6871155581.

The spelling of 505665566 in words is "five hundred five million, six hundred sixty-five thousand, five hundred sixty-six".