561608560828 has 96 divisors (see below), whose sum is σ = 1173150720000. Its totient is φ = 230188780800.

The previous prime is 561608560813. The next prime is 561608560831. The reversal of 561608560828 is 828065806165.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25726158 + ... + 25747978.

It is an arithmetic number, because the mean of its divisors is an integer number (12220320000).

Almost surely, 2^561608560828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561608560828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (586575360000).

561608560828 is an abundant number, since it is smaller than the sum of its proper divisors (611542159172).

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

561608560828 is a wasteful number, since it uses less digits than its factorization.

561608560828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22211 (or 22209 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 55.

The spelling of 561608560828 in words is "five hundred sixty-one billion, six hundred eight million, five hundred sixty thousand, eight hundred twenty-eight".