561455559 has 24 divisors (see below), whose sum is σ = 930918560. Its totient is φ = 319422528.

The previous prime is 561455551. The next prime is 561455563. The reversal of 561455559 is 955554165.

561455559 is a `hidden beast` number, since 56 + 1 + 45 + 5 + 559 = 666.

561455559 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 561455559 - 2³ = 561455551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561455551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5032 + ... + 33885.

Almost surely, 2^561455559 is an apocalyptic number.

561455559 is a deficient number, since it is larger than the sum of its proper divisors (369463001).

561455559 is a wasteful number, since it uses less digits than its factorization.

561455559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39159 (or 39156 counting only the distinct ones).

The product of its digits is 675000, while the sum is 45.

The square root of 561455559 is about 23695.0534711361. The cubic root of 561455559 is about 824.9705818711.

The spelling of 561455559 in words is "five hundred sixty-one million, four hundred fifty-five thousand, five hundred fifty-nine".