655656585656549 has 2 divisors, whose sum is σ = 655656585656550. Its totient is φ = 655656585656548.

The previous prime is 655656585656531. The next prime is 655656585656561. The reversal of 655656585656549 is 945656585656556.

655656585656549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 328008574554049 + 327648011102500 = 18111007^2 + 18101050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655656585656549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655656585686549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327828292828274 + 327828292828275.

It is an arithmetic number, because the mean of its divisors is an integer number (327828292828275).

Almost surely, 2^{655656585656549} is an apocalyptic number.

It is an amenable number.

655656585656549 is a deficient number, since it is larger than the sum of its proper divisors (1).

655656585656549 is an equidigital number, since it uses as much as digits as its factorization.

655656585656549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960000000, while the sum is 86.

The spelling of 655656585656549 in words is "six hundred fifty-five trillion, six hundred fifty-six billion, five hundred eighty-five million, six hundred fifty-six thousand, five hundred forty-nine".