506561010565 has 4 divisors (see below), whose sum is σ = 607873212684. Its totient is φ = 405248808448.

The previous prime is 506561010451. The next prime is 506561010581. The reversal of 506561010565 is 565010165605.

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 193640482116 + 312920528449 = 440046^2 + 559393^2 .

It is a cyclic number.

It is not a de Polignac number, because 506561010565 - 2⁷ = 506561010437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50656101052 + ... + 50656101061.

It is an arithmetic number, because the mean of its divisors is an integer number (151968303171).

Almost surely, 2^506561010565 is an apocalyptic number.

It is an amenable number.

506561010565 is a deficient number, since it is larger than the sum of its proper divisors (101312202119).

506561010565 is a wasteful number, since it uses less digits than its factorization.

506561010565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101312202118.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 506561010565 in words is "five hundred six billion, five hundred sixty-one million, ten thousand, five hundred sixty-five".