561061564 has 48 divisors (see below), whose sum is σ = 1205344000. Its totient is φ = 227788848.

The previous prime is 561061559. The next prime is 561061619. The reversal of 561061564 is 465160165.

It is a happy number.

561061564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15307 + ... + 36829.

Almost surely, 2^561061564 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 561061564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (602672000).

561061564 is an abundant number, since it is smaller than the sum of its proper divisors (644282436).

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

561061564 is a wasteful number, since it uses less digits than its factorization.

561061564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21567 (or 21551 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 561061564 is about 23686.7381460597. The cubic root of 561061564 is about 824.7775654999. Note that the first 3 decimals are identical.

The spelling of 561061564 in words is "five hundred sixty-one million, sixty-one thousand, five hundred sixty-four".