505565565 has 16 divisors (see below), whose sum is σ = 809664768. Its totient is φ = 269381696.

The previous prime is 505565561. The next prime is 505565573. The reversal of 505565565 is 565565505.

It is a cyclic number.

It is not a de Polignac number, because 505565565 - 2² = 505565561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505565561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1267 + ... + 31823.

It is an arithmetic number, because the mean of its divisors is an integer number (50604048).

Almost surely, 2^505565565 is an apocalyptic number.

It is an amenable number.

505565565 is a deficient number, since it is larger than the sum of its proper divisors (304099203).

505565565 is a wasteful number, since it uses less digits than its factorization.

505565565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31668.

The product of its (nonzero) digits is 562500, while the sum is 42.

The square root of 505565565 is about 22484.7851891007. The cubic root of 505565565 is about 796.6345941777.

The spelling of 505565565 in words is "five hundred five million, five hundred sixty-five thousand, five hundred sixty-five".