561561606500 has 24 divisors (see below), whose sum is σ = 1226450549688. Its totient is φ = 224624642400.

The previous prime is 561561606479. The next prime is 561561606503. The reversal of 561561606500 is 5606165165.

561561606500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 461734144 + 561099872356 = 21488^2 + 749066^2 .

It is not an unprimeable number, because it can be changed into a prime (561561606503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561561107 + ... + 561562106.

It is an arithmetic number, because the mean of its divisors is an integer number (51102106237).

Almost surely, 2^561561606500 is an apocalyptic number.

561561606500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561561606500 is an abundant number, since it is smaller than the sum of its proper divisors (664888943188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561561606500 is a wasteful number, since it uses less digits than its factorization.

561561606500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123123232 (or 1123123220 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 561561606500 in words is "five hundred sixty-one billion, five hundred sixty-one million, six hundred six thousand, five hundred".