6561655116217 has 8 divisors (see below), whose sum is σ = 6847027641216. Its totient is φ = 6276289522272.

The previous prime is 6561655116197. The next prime is 6561655116259. The reversal of 6561655116217 is 7126115561656.

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

It is a cyclic number.

It is not a de Polignac number, because 6561655116217 - 2⁷ = 6561655116089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6561653116217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250108 + ... + 3631234.

It is an arithmetic number, because the mean of its divisors is an integer number (855878455152).

Almost surely, 2^{6561655116217} is an apocalyptic number.

It is an amenable number.

6561655116217 is a deficient number, since it is larger than the sum of its proper divisors (285372524999).

6561655116217 is a wasteful number, since it uses less digits than its factorization.

6561655116217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3465527.

The product of its digits is 2268000, while the sum is 52.

The spelling of 6561655116217 in words is "six trillion, five hundred sixty-one billion, six hundred fifty-five million, one hundred sixteen thousand, two hundred seventeen".