9544809532561 has 12 divisors (see below), whose sum is σ = 9980199425700. Its totient is φ = 9127662917120.

The previous prime is 9544809532547. The next prime is 9544809532571. The reversal of 9544809532561 is 1652359084459.

It is a happy number.

9544809532561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4196991406336 + 5347818126225 = 2048656^2 + 2312535^2 .

It is not a de Polignac number, because 9544809532561 - 2⁵ = 9544809532529 is a prime.

It is a super-2 number, since 2×9544809532561² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9544809532561.

It is not an unprimeable number, because it can be changed into a prime (9544809532571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116265 + ... + 4370713.

It is an arithmetic number, because the mean of its divisors is an integer number (831683285475).

Almost surely, 2^{9544809532561} is an apocalyptic number.

It is an amenable number.

9544809532561 is a deficient number, since it is larger than the sum of its proper divisors (435389893139).

9544809532561 is a wasteful number, since it uses less digits than its factorization.

9544809532561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4258736 (or 4258713 counting only the distinct ones).

The product of its (nonzero) digits is 46656000, while the sum is 61.

The spelling of 9544809532561 in words is "nine trillion, five hundred forty-four billion, eight hundred nine million, five hundred thirty-two thousand, five hundred sixty-one".