4856646721 has 2 divisors, whose sum is σ = 4856646722. Its totient is φ = 4856646720.

The previous prime is 4856646667. The next prime is 4856646757. The reversal of 4856646721 is 1276466584.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4856556721 + 90000 = 69689^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 4856646721 - 2¹⁵ = 4856613953 is a prime.

It is not a weakly prime, because it can be changed into another prime (4856646761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2428323360 + 2428323361.

It is an arithmetic number, because the mean of its divisors is an integer number (2428323361).

Almost surely, 2^4856646721 is an apocalyptic number.

It is an amenable number.

4856646721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4856646721 is an equidigital number, since it uses as much as digits as its factorization.

4856646721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 49.

The square root of 4856646721 is about 69689.6457230197. The cubic root of 4856646721 is about 1693.4751874940.

The spelling of 4856646721 in words is "four billion, eight hundred fifty-six million, six hundred forty-six thousand, seven hundred twenty-one".