6721228644617 has 2 divisors, whose sum is σ = 6721228644618. Its totient is φ = 6721228644616.

The previous prime is 6721228644469. The next prime is 6721228644679. The reversal of 6721228644617 is 7164468221276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6603774387961 + 117454256656 = 2569781^2 + 342716^2 .

It is a cyclic number.

It is not a de Polignac number, because 6721228644617 - 2¹⁰ = 6721228643593 is a prime.

It is not a weakly prime, because it can be changed into another prime (6721228640617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360614322308 + 3360614322309.

It is an arithmetic number, because the mean of its divisors is an integer number (3360614322309).

Almost surely, 2^{6721228644617} is an apocalyptic number.

It is an amenable number.

6721228644617 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721228644617 is an equidigital number, since it uses as much as digits as its factorization.

6721228644617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10838016, while the sum is 56.

The spelling of 6721228644617 in words is "six trillion, seven hundred twenty-one billion, two hundred twenty-eight million, six hundred forty-four thousand, six hundred seventeen".