16866866866813 has 2 divisors, whose sum is σ = 16866866866814. Its totient is φ = 16866866866812.

The previous prime is 16866866866771. The next prime is 16866866866891. The reversal of 16866866866813 is 31866866866861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16323717028644 + 543149838169 = 4040262^2 + 736987^2 .

It is a cyclic number.

It is not a de Polignac number, because 16866866866813 - 2⁹ = 16866866866301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16866866366813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8433433433406 + 8433433433407.

It is an arithmetic number, because the mean of its divisors is an integer number (8433433433407).

Almost surely, 2^{16866866866813} is an apocalyptic number.

It is an amenable number.

16866866866813 is a deficient number, since it is larger than the sum of its proper divisors (1).

16866866866813 is an equidigital number, since it uses as much as digits as its factorization.

16866866866813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3439853568, while the sum is 79.

The spelling of 16866866866813 in words is "sixteen trillion, eight hundred sixty-six billion, eight hundred sixty-six million, eight hundred sixty-six thousand, eight hundred thirteen".