8664425556217 has 2 divisors, whose sum is σ = 8664425556218. Its totient is φ = 8664425556216.

The previous prime is 8664425556109. The next prime is 8664425556221. The reversal of 8664425556217 is 7126555244668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5913242704656 + 2751182851561 = 2431716^2 + 1658669^2 .

It is a cyclic number.

It is not a de Polignac number, because 8664425556217 - 2⁷ = 8664425556089 is a prime.

It is not a weakly prime, because it can be changed into another prime (8664425556257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4332212778108 + 4332212778109.

It is an arithmetic number, because the mean of its divisors is an integer number (4332212778109).

Almost surely, 2^{8664425556217} is an apocalyptic number.

It is an amenable number.

8664425556217 is a deficient number, since it is larger than the sum of its proper divisors (1).

8664425556217 is an equidigital number, since it uses as much as digits as its factorization.

8664425556217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768000, while the sum is 61.

The spelling of 8664425556217 in words is "eight trillion, six hundred sixty-four billion, four hundred twenty-five million, five hundred fifty-six thousand, two hundred seventeen".