10561000561 has 4 divisors (see below), whose sum is σ = 10561314724. Its totient is φ = 10560686400.

The previous prime is 10561000553. The next prime is 10561000573. The reversal of 10561000561 is 16500016501.

10561000561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10428290161 + 132710400 = 102119^2 + 11520^2 .

It is a cyclic number.

It is not a de Polignac number, because 10561000561 - 2³ = 10561000553 is a prime.

It is a super-2 number, since 2×10561000561² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10561000501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99660 + ... + 176221.

It is an arithmetic number, because the mean of its divisors is an integer number (2640328681).

Almost surely, 2^10561000561 is an apocalyptic number.

It is an amenable number.

10561000561 is a deficient number, since it is larger than the sum of its proper divisors (314163).

10561000561 is an equidigital number, since it uses as much as digits as its factorization.

10561000561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314162.

The product of its (nonzero) digits is 900, while the sum is 25.

The spelling of 10561000561 in words is "ten billion, five hundred sixty-one million, five hundred sixty-one", and thus it is an aban number.