6561104544 has 48 divisors (see below), whose sum is σ = 19136557440. Its totient is φ = 2187034560.

The previous prime is 6561104527. The next prime is 6561104573. The reversal of 6561104544 is 4454011656.

6561104544 is a `hidden beast` number, since 6 + 5 + 6 + 1 + 104 + 544 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6561104499 and 6561104508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3796072 + ... + 3797799.

It is an arithmetic number, because the mean of its divisors is an integer number (398678280).

Almost surely, 2^6561104544 is an apocalyptic number.

It is an amenable number.

6561104544 is an abundant number, since it is smaller than the sum of its proper divisors (12575452896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6561104544 is a wasteful number, since it uses less digits than its factorization.

6561104544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7593890 (or 7593876 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 6561104544 is about 81000.6453307626. The cubic root of 6561104544 is about 1872.0853840082.

The spelling of 6561104544 in words is "six billion, five hundred sixty-one million, one hundred four thousand, five hundred forty-four".