505660565 has 4 divisors (see below), whose sum is σ = 606792684. Its totient is φ = 404528448.

The previous prime is 505660553. The next prime is 505660567. The reversal of 505660565 is 565066505.

It is a happy number.

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 219306481 + 286354084 = 14809^2 + 16922^2 .

It is a cyclic number.

It is not a de Polignac number, because 505660565 - 2¹⁰ = 505659541 is a prime.

It is a super-2 number, since 2×505660565² = 511385213992238450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505660567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50566052 + ... + 50566061.

It is an arithmetic number, because the mean of its divisors is an integer number (151698171).

Almost surely, 2^505660565 is an apocalyptic number.

It is an amenable number.

505660565 is a deficient number, since it is larger than the sum of its proper divisors (101132119).

505660565 is a wasteful number, since it uses less digits than its factorization.

505660565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101132118.

The product of its (nonzero) digits is 135000, while the sum is 38.

The square root of 505660565 is about 22486.8976295086. The cubic root of 505660565 is about 796.6844891546.

The spelling of 505660565 in words is "five hundred five million, six hundred sixty thousand, five hundred sixty-five".