6564655123 has 4 divisors (see below), whose sum is σ = 7069628608. Its totient is φ = 6059681640.

The previous prime is 6564655121. The next prime is 6564655169. The reversal of 6564655123 is 3215564656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6564655123 - 2¹ = 6564655121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6564655123.

It is not an unprimeable number, because it can be changed into a prime (6564655121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252486723 + ... + 252486748.

It is an arithmetic number, because the mean of its divisors is an integer number (1767407152).

Almost surely, 2^6564655123 is an apocalyptic number.

6564655123 is a deficient number, since it is larger than the sum of its proper divisors (504973485).

6564655123 is a wasteful number, since it uses less digits than its factorization.

6564655123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504973484.

The product of its digits is 648000, while the sum is 43.

The square root of 6564655123 is about 81022.5593461475. The cubic root of 6564655123 is about 1872.4230196582.

The spelling of 6564655123 in words is "six billion, five hundred sixty-four million, six hundred fifty-five thousand, one hundred twenty-three".