6561578552 has 32 divisors (see below), whose sum is σ = 12858130080. Its totient is φ = 3133194240.

The previous prime is 6561578549. The next prime is 6561578561. The reversal of 6561578552 is 2558751656.

It is a self number, because there is not a number n which added to its sum of digits gives 6561578552.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 90128 + ... + 145760.

It is an arithmetic number, because the mean of its divisors is an integer number (401816565).

Almost surely, 2^6561578552 is an apocalyptic number.

It is an amenable number.

6561578552 is a deficient number, since it is larger than the sum of its proper divisors (6296551528).

6561578552 is a wasteful number, since it uses less digits than its factorization.

6561578552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56303 (or 56299 counting only the distinct ones).

The product of its digits is 2520000, while the sum is 50.

The square root of 6561578552 is about 81003.5712299155. The cubic root of 6561578552 is about 1872.1304659541.

The spelling of 6561578552 in words is "six billion, five hundred sixty-one million, five hundred seventy-eight thousand, five hundred fifty-two".