561651409144 has 96 divisors (see below), whose sum is σ = 1231230369600. Its totient is φ = 239491365120.

The previous prime is 561651409091. The next prime is 561651409181. The reversal of 561651409144 is 441904156165.

It is a junction number, because it is equal to n+sod(n) for n = 561651409094 and 561651409103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158612014 + ... + 158615554.

It is an arithmetic number, because the mean of its divisors is an integer number (12825316350).

Almost surely, 2^561651409144 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 561651409144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (615615184800).

561651409144 is an abundant number, since it is smaller than the sum of its proper divisors (669578960456).

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

561651409144 is a wasteful number, since it uses less digits than its factorization.

561651409144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5493 (or 5482 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 561651409144 in words is "five hundred sixty-one billion, six hundred fifty-one million, four hundred nine thousand, one hundred forty-four".