506565220709 has 4 divisors (see below), whose sum is σ = 516123055116. Its totient is φ = 497007386304.

The previous prime is 506565220691. The next prime is 506565220751. The reversal of 506565220709 is 907022565605.

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 464003467684 + 42561753025 = 681178^2 + 206305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-506565220709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506565220789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4778917124 + ... + 4778917229.

It is an arithmetic number, because the mean of its divisors is an integer number (129030763779).

Almost surely, 2^506565220709 is an apocalyptic number.

It is an amenable number.

506565220709 is a deficient number, since it is larger than the sum of its proper divisors (9557834407).

506565220709 is an equidigital number, since it uses as much as digits as its factorization.

506565220709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9557834406.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 506565220709 in words is "five hundred six billion, five hundred sixty-five million, two hundred twenty thousand, seven hundred nine".