6605776321 has 2 divisors, whose sum is σ = 6605776322. Its totient is φ = 6605776320.

The previous prime is 6605776319. The next prime is 6605776363. The reversal of 6605776321 is 1236775066.

6605776321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5230182400 + 1375593921 = 72320^2 + 37089^2 .

It is a cyclic number.

It is not a de Polignac number, because 6605776321 - 2¹ = 6605776319 is a prime.

Together with 6605776319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6605776301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3302888160 + 3302888161.

It is an arithmetic number, because the mean of its divisors is an integer number (3302888161).

Almost surely, 2^6605776321 is an apocalyptic number.

It is an amenable number.

6605776321 is a deficient number, since it is larger than the sum of its proper divisors (1).

6605776321 is an equidigital number, since it uses as much as digits as its factorization.

6605776321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 6605776321 is about 81275.9270694589. The cubic root of 6605776321 is about 1876.3245227045.

The spelling of 6605776321 in words is "six billion, six hundred five million, seven hundred seventy-six thousand, three hundred twenty-one".