6555566656209 has 8 divisors (see below), whose sum is σ = 9200795307040. Its totient is φ = 4140357888096.

The previous prime is 6555566656207. The next prime is 6555566656253. The reversal of 6555566656209 is 9026566655556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6555566656209 - 2¹ = 6555566656207 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 6555566656209.

It is not an unprimeable number, because it can be changed into a prime (6555566656201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57504970612 + ... + 57504970725.

It is an arithmetic number, because the mean of its divisors is an integer number (1150099413380).

Almost surely, 2^{6555566656209} is an apocalyptic number.

It is an amenable number.

6555566656209 is a deficient number, since it is larger than the sum of its proper divisors (2645228650831).

6555566656209 is a wasteful number, since it uses less digits than its factorization.

6555566656209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115009941359.

The product of its (nonzero) digits is 437400000, while the sum is 66.

The spelling of 6555566656209 in words is "six trillion, five hundred fifty-five billion, five hundred sixty-six million, six hundred fifty-six thousand, two hundred nine".