8777552221 has 2 divisors, whose sum is σ = 8777552222. Its totient is φ = 8777552220.

The previous prime is 8777552209. The next prime is 8777552233. The reversal of 8777552221 is 1222557778.

8777552221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (8777552209) and next prime (8777552233).

It can be written as a sum of positive squares in only one way, i.e., 6990799321 + 1786752900 = 83611^2 + 42270^2 .

It is a cyclic number.

It is not a de Polignac number, because 8777552221 - 2¹⁵ = 8777519453 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8777552921) 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, 4388776110 + 4388776111.

It is an arithmetic number, because the mean of its divisors is an integer number (4388776111).

Almost surely, 2^8777552221 is an apocalyptic number.

It is an amenable number.

8777552221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8777552221 is an equidigital number, since it uses as much as digits as its factorization.

8777552221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 548800, while the sum is 46.

The square root of 8777552221 is about 93688.5917334656. The cubic root of 8777552221 is about 2062.8032515769.

The spelling of 8777552221 in words is "eight billion, seven hundred seventy-seven million, five hundred fifty-two thousand, two hundred twenty-one".