561668544 has 84 divisors (see below), whose sum is σ = 1614915744. Its totient is φ = 186642432.

The previous prime is 561668501. The next prime is 561668551. The reversal of 561668544 is 445866165.

561668544 is a `hidden beast` number, since 561 + 6 + 6 + 85 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 561668544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210064 + ... + 212720.

Almost surely, 2^561668544 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 561668544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (807457872).

561668544 is an abundant number, since it is smaller than the sum of its proper divisors (1053247200).

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

561668544 is a wasteful number, since it uses less digits than its factorization.

561668544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3042 (or 3029 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 561668544 is about 23699.5473374493. The cubic root of 561668544 is about 825.0748846626.

The spelling of 561668544 in words is "five hundred sixty-one million, six hundred sixty-eight thousand, five hundred forty-four".