6564556545 has 16 divisors (see below), whose sum is σ = 11121131520. Its totient is φ = 3295149824.

The previous prime is 6564556499. The next prime is 6564556549. The reversal of 6564556545 is 5456554656.

It is a cyclic number.

It is not a de Polignac number, because 6564556545 - 2⁷ = 6564556417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6564556549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12871425 + ... + 12871934.

It is an arithmetic number, because the mean of its divisors is an integer number (695070720).

Almost surely, 2^6564556545 is an apocalyptic number.

It is an amenable number.

6564556545 is a deficient number, since it is larger than the sum of its proper divisors (4556574975).

6564556545 is a wasteful number, since it uses less digits than its factorization.

6564556545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25743384.

The product of its digits is 10800000, while the sum is 51.

The square root of 6564556545 is about 81021.9510071191. The cubic root of 6564556545 is about 1872.4136472115.

The spelling of 6564556545 in words is "six billion, five hundred sixty-four million, five hundred fifty-six thousand, five hundred forty-five".