561428641856 has 56 divisors (see below), whose sum is σ = 1130928761760. Its totient is φ = 276471816192.

The previous prime is 561428641841. The next prime is 561428641861. The reversal of 561428641856 is 658146824165.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32104091 + ... + 32121573.

It is an arithmetic number, because the mean of its divisors is an integer number (20195156460).

Almost surely, 2^561428641856 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 561428641856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (565464380880).

561428641856 is an abundant number, since it is smaller than the sum of its proper divisors (569500119904).

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

561428641856 is a wasteful number, since it uses less digits than its factorization.

561428641856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25051 (or 25041 counting only the distinct ones).

The product of its digits is 11059200, while the sum is 56.

The spelling of 561428641856 in words is "five hundred sixty-one billion, four hundred twenty-eight million, six hundred forty-one thousand, eight hundred fifty-six".