6604620444221 has 2 divisors, whose sum is σ = 6604620444222. Its totient is φ = 6604620444220.

The previous prime is 6604620444193. The next prime is 6604620444313. The reversal of 6604620444221 is 1224440264066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4944014508196 + 1660605936025 = 2223514^2 + 1288645^2 .

It is a cyclic number.

It is not a de Polignac number, because 6604620444221 - 2⁶ = 6604620444157 is a prime.

It is a super-2 number, since 2×6604620444221² (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 (6604620434221) 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, 3302310222110 + 3302310222111.

It is an arithmetic number, because the mean of its divisors is an integer number (3302310222111).

Almost surely, 2^{6604620444221} is an apocalyptic number.

It is an amenable number.

6604620444221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6604620444221 is an equidigital number, since it uses as much as digits as its factorization.

6604620444221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 442368, while the sum is 41.

The spelling of 6604620444221 in words is "six trillion, six hundred four billion, six hundred twenty million, four hundred forty-four thousand, two hundred twenty-one".