6556506609 has 4 divisors (see below), whose sum is σ = 8742008816. Its totient is φ = 4371004404.

The previous prime is 6556506559. The next prime is 6556506611. The reversal of 6556506609 is 9066056556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6556506609 - 2²¹ = 6554409457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6556506659) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1092751099 + ... + 1092751104.

It is an arithmetic number, because the mean of its divisors is an integer number (2185502204).

Almost surely, 2^6556506609 is an apocalyptic number.

It is an amenable number.

6556506609 is a deficient number, since it is larger than the sum of its proper divisors (2185502207).

6556506609 is a wasteful number, since it uses less digits than its factorization.

6556506609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185502206.

The product of its (nonzero) digits is 1458000, while the sum is 48.

The square root of 6556506609 is about 80972.2582678784. The cubic root of 6556506609 is about 1871.6479709495.

The spelling of 6556506609 in words is "six billion, five hundred fifty-six million, five hundred six thousand, six hundred nine".