6646554636613 has 2 divisors, whose sum is σ = 6646554636614. Its totient is φ = 6646554636612.

The previous prime is 6646554636581. The next prime is 6646554636629. The reversal of 6646554636613 is 3166364556466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6553103369409 + 93451267204 = 2559903^2 + 305698^2 .

It is a cyclic number.

It is not a de Polignac number, because 6646554636613 - 2⁵ = 6646554636581 is a prime.

It is a super-2 number, since 2×6646554636613² (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 (6646554630613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323277318306 + 3323277318307.

It is an arithmetic number, because the mean of its divisors is an integer number (3323277318307).

Almost surely, 2^{6646554636613} is an apocalyptic number.

It is an amenable number.

6646554636613 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646554636613 is an equidigital number, since it uses as much as digits as its factorization.

6646554636613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 167961600, while the sum is 61.

The spelling of 6646554636613 in words is "six trillion, six hundred forty-six billion, five hundred fifty-four million, six hundred thirty-six thousand, six hundred thirteen".