6561578504 has 32 divisors (see below), whose sum is σ = 13499340120. Its totient is φ = 2971278336.

The previous prime is 6561578461. The next prime is 6561578509. The reversal of 6561578504 is 4058751656.

It can be written as a sum of positive squares in 4 ways, for example, as 4660792900 + 1900785604 = 68270^2 + 43598^2 .

It is not an unprimeable number, because it can be changed into a prime (6561578509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 589697 + ... + 600720.

Almost surely, 2^6561578504 is an apocalyptic number.

It is an amenable number.

6561578504 is an abundant number, since it is smaller than the sum of its proper divisors (6937761616).

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

6561578504 is a wasteful number, since it uses less digits than its factorization.

6561578504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1190489 (or 1190485 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 47.

The square root of 6561578504 is about 81003.5709336323. The cubic root of 6561578504 is about 1872.1304613890.

The spelling of 6561578504 in words is "six billion, five hundred sixty-one million, five hundred seventy-eight thousand, five hundred four".