8666688413 has 2 divisors, whose sum is σ = 8666688414. Its totient is φ = 8666688412.

The previous prime is 8666688403. The next prime is 8666688449. The reversal of 8666688413 is 3148866668.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5903924569 + 2762763844 = 76837^2 + 52562^2 .

It is a cyclic number.

It is not a de Polignac number, because 8666688413 - 2²⁰ = 8665639837 is a prime.

It is a super-2 number, since 2×8666688413² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8666688403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4333344206 + 4333344207.

It is an arithmetic number, because the mean of its divisors is an integer number (4333344207).

Almost surely, 2^8666688413 is an apocalyptic number.

It is an amenable number.

8666688413 is a deficient number, since it is larger than the sum of its proper divisors (1).

8666688413 is an equidigital number, since it uses as much as digits as its factorization.

8666688413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7962624, while the sum is 56.

The square root of 8666688413 is about 93095.0504215987. The cubic root of 8666688413 is about 2054.0817672755.

The spelling of 8666688413 in words is "eight billion, six hundred sixty-six million, six hundred eighty-eight thousand, four hundred thirteen".