500550000561 has 12 divisors (see below), whose sum is σ = 778633334388. Its totient is φ = 308030769504.

The previous prime is 500550000491. The next prime is 500550000571. The reversal of 500550000561 is 165000055005.

500550000561 is a `hidden beast` number, since 50 + 0 + 5 + 50 + 0 + 0 + 0 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 146875963536 + 353674037025 = 383244^2 + 594705^2 .

It is not a de Polignac number, because 500550000561 - 2¹¹ = 500549998513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (500550000571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2139102450 + ... + 2139102683.

It is an arithmetic number, because the mean of its divisors is an integer number (64886111199).

Almost surely, 2^500550000561 is an apocalyptic number.

It is an amenable number.

500550000561 is a deficient number, since it is larger than the sum of its proper divisors (278083333827).

500550000561 is a wasteful number, since it uses less digits than its factorization.

500550000561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278205152 (or 4278205149 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

Adding to 500550000561 its reverse (165000055005), we get a palindrome (665550055566).

The spelling of 500550000561 in words is "five hundred billion, five hundred fifty million, five hundred sixty-one", and thus it is an aban number.