6772722221 has 2 divisors, whose sum is σ = 6772722222. Its totient is φ = 6772722220.

The previous prime is 6772722193. The next prime is 6772722247. The reversal of 6772722221 is 1222272776.

6772722221 is digitally balanced in base 3, 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., 4275721321 + 2497000900 = 65389^2 + 49970^2 .

It is a cyclic number.

It is not a de Polignac number, because 6772722221 - 2¹⁸ = 6772460077 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 (6772722251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3386361110 + 3386361111.

It is an arithmetic number, because the mean of its divisors is an integer number (3386361111).

Almost surely, 2^6772722221 is an apocalyptic number.

It is an amenable number.

6772722221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6772722221 is an equidigital number, since it uses as much as digits as its factorization.

6772722221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65856, while the sum is 38.

The square root of 6772722221 is about 82296.5504805639. The cubic root of 6772722221 is about 1891.9998075238. Note that the first 3 decimals are identical.

Adding to 6772722221 its reverse (1222272776), we get a palindrome (7994994997).

The spelling of 6772722221 in words is "six billion, seven hundred seventy-two million, seven hundred twenty-two thousand, two hundred twenty-one".