500005005561 has 12 divisors (see below), whose sum is σ = 723178515540. Its totient is φ = 332898641280.

The previous prime is 500005005553. The next prime is 500005005581. The reversal of 500005005561 is 165500500005.

500005005561 is a `hidden beast` number, since 50 + 0 + 0 + 0 + 50 + 0 + 5 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5312223225 + 494692782336 = 72885^2 + 703344^2 .

It is not a de Polignac number, because 500005005561 - 2³ = 500005005553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (500005005581) 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 11 ways as a sum of consecutive naturals, for example, 36495196 + ... + 36508893.

It is an arithmetic number, because the mean of its divisors is an integer number (60264876295).

Almost surely, 2^500005005561 is an apocalyptic number.

It is an amenable number.

500005005561 is a deficient number, since it is larger than the sum of its proper divisors (223173509979).

500005005561 is a wasteful number, since it uses less digits than its factorization.

500005005561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73004856 (or 73004853 counting only the distinct ones).

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

Adding to 500005005561 its reverse (165500500005), we get a palindrome (665505505566).

The spelling of 500005005561 in words is "five hundred billion, five million, five thousand, five hundred sixty-one".