6556438217 has 16 divisors (see below), whose sum is σ = 7739077632. Its totient is φ = 5435501760.

The previous prime is 6556438211. The next prime is 6556438223. The reversal of 6556438217 is 7128346556.

It is an interprime number because it is at equal distance from previous prime (6556438211) and next prime (6556438223).

It is a cyclic number.

It is not a de Polignac number, because 6556438217 - 2¹⁰ = 6556437193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6556438211) 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 15 ways as a sum of consecutive naturals, for example, 438143 + ... + 452859.

It is an arithmetic number, because the mean of its divisors is an integer number (483692352).

Almost surely, 2^6556438217 is an apocalyptic number.

It is an amenable number.

6556438217 is a deficient number, since it is larger than the sum of its proper divisors (1182639415).

6556438217 is a wasteful number, since it uses less digits than its factorization.

6556438217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16808.

The product of its digits is 1209600, while the sum is 47.

The square root of 6556438217 is about 80971.8359492978. The cubic root of 6556438217 is about 1871.6414631042.

The spelling of 6556438217 in words is "six billion, five hundred fifty-six million, four hundred thirty-eight thousand, two hundred seventeen".