10561055605561 has 16 divisors (see below), whose sum is σ = 11299392182736. Its totient is φ = 9835762876416.

The previous prime is 10561055605517. The next prime is 10561055605589. The reversal of 10561055605561 is 16550655016501.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2038270182400 + 8522785423161 = 1427680^2 + 2919381^2 .

It is not a de Polignac number, because 10561055605561 - 2⁹ = 10561055605049 is a prime.

It is a super-2 number, since 2×10561055605561² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10561055605501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9806005 + ... + 10829581.

It is an arithmetic number, because the mean of its divisors is an integer number (706212011421).

Almost surely, 2^{10561055605561} is an apocalyptic number.

It is an amenable number.

10561055605561 is a deficient number, since it is larger than the sum of its proper divisors (738336577175).

10561055605561 is a wasteful number, since it uses less digits than its factorization.

10561055605561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029948.

The product of its (nonzero) digits is 675000, while the sum is 46.

It can be divided in two parts, 1056105 and 5605561, that added together give a palindrome (6661666).

The spelling of 10561055605561 in words is "ten trillion, five hundred sixty-one billion, fifty-five million, six hundred five thousand, five hundred sixty-one".