561605555500 has 48 divisors (see below), whose sum is σ = 1338050776608. Its totient is φ = 204220200000.

The previous prime is 561605555477. The next prime is 561605555501. The reversal of 561605555500 is 5555506165.

It is not an unprimeable number, because it can be changed into a prime (561605555501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51049551 + ... + 51060550.

It is an arithmetic number, because the mean of its divisors is an integer number (27876057846).

Almost surely, 2^561605555500 is an apocalyptic number.

561605555500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561605555500 is an abundant number, since it is smaller than the sum of its proper divisors (776445221108).

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

561605555500 is a wasteful number, since it uses less digits than its factorization.

561605555500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102110131 (or 102110119 counting only the distinct ones).

The product of its (nonzero) digits is 562500, while the sum is 43.

The spelling of 561605555500 in words is "five hundred sixty-one billion, six hundred five million, five hundred fifty-five thousand, five hundred".