8666644417 has 2 divisors, whose sum is σ = 8666644418. Its totient is φ = 8666644416.

The previous prime is 8666644381. The next prime is 8666644447. The reversal of 8666644417 is 7144466668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4434361281 + 4232283136 = 66591^2 + 65056^2 .

It is a cyclic number.

It is not a de Polignac number, because 8666644417 - 2¹⁹ = 8666120129 is a prime.

It is a super-2 number, since 2×8666644417² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8666644447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4333322208 + 4333322209.

It is an arithmetic number, because the mean of its divisors is an integer number (4333322209).

Almost surely, 2^8666644417 is an apocalyptic number.

It is an amenable number.

8666644417 is a deficient number, since it is larger than the sum of its proper divisors (1).

8666644417 is an equidigital number, since it uses as much as digits as its factorization.

8666644417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 52.

The square root of 8666644417 is about 93094.8141251703. The cubic root of 8666644417 is about 2054.0782914560.

The spelling of 8666644417 in words is "eight billion, six hundred sixty-six million, six hundred forty-four thousand, four hundred seventeen".