6666326655613 has 2 divisors, whose sum is σ = 6666326655614. Its totient is φ = 6666326655612.

The previous prime is 6666326655577. The next prime is 6666326655619. The reversal of 6666326655613 is 3165566236666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3927162633849 + 2739164021764 = 1981707^2 + 1655042^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666326655613 - 2⁹ = 6666326655101 is a prime.

It is a super-2 number, since 2×6666326655613² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6666326655619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333163327806 + 3333163327807.

It is an arithmetic number, because the mean of its divisors is an integer number (3333163327807).

Almost surely, 2^{6666326655613} is an apocalyptic number.

It is an amenable number.

6666326655613 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666326655613 is an equidigital number, since it uses as much as digits as its factorization.

6666326655613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 125971200, while the sum is 61.

The spelling of 6666326655613 in words is "six trillion, six hundred sixty-six billion, three hundred twenty-six million, six hundred fifty-five thousand, six hundred thirteen".