6561272004004 has 27 divisors (see below), whose sum is σ = 11502784172971. Its totient is φ = 3274772733080.

The previous prime is 6561272003963. The next prime is 6561272004013. The reversal of 6561272004004 is 4004002721656.

The square root of 6561272004004 is 2561498.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4974428457 + ... + 4974429775.

Almost surely, 2^{6561272004004} is an apocalyptic number.

6561272004004 is the 2561498-th square number.

It is an amenable number.

6561272004004 is a deficient number, since it is larger than the sum of its proper divisors (4941512168967).

6561272004004 is an frugal number, since it uses more digits than its factorization.

6561272004004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4584 (or 2292 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 6561272004004 in words is "six trillion, five hundred sixty-one billion, two hundred seventy-two million, four thousand, four".