5561571660561 has 48 divisors (see below), whose sum is σ = 9404635743360. Its totient is φ = 3100790246400.

The previous prime is 5561571660529. The next prime is 5561571660563. The reversal of 5561571660561 is 1650661751655.

5561571660561 is a `hidden beast` number, since 5 + 5 + 6 + 1 + 5 + 7 + 16 + 60 + 561 = 666.

It is not a de Polignac number, because 5561571660561 - 2⁵ = 5561571660529 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 5561571660498 and 5561571660507.

It is not an unprimeable number, because it can be changed into a prime (5561571660563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1411711 + ... + 3621611.

It is an arithmetic number, because the mean of its divisors is an integer number (195929911320).

Almost surely, 2^{5561571660561} is an apocalyptic number.

It is an amenable number.

5561571660561 is a deficient number, since it is larger than the sum of its proper divisors (3843064082799).

5561571660561 is a wasteful number, since it uses less digits than its factorization.

5561571660561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210886 (or 2210883 counting only the distinct ones).

The product of its (nonzero) digits is 5670000, while the sum is 54.

The spelling of 5561571660561 in words is "five trillion, five hundred sixty-one billion, five hundred seventy-one million, six hundred sixty thousand, five hundred sixty-one".