6720556489 has 2 divisors, whose sum is σ = 6720556490. Its totient is φ = 6720556488.

The previous prime is 6720556393. The next prime is 6720556511. The reversal of 6720556489 is 9846550276.

6720556489 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., 4721751225 + 1998805264 = 68715^2 + 44708^2 .

It is a cyclic number.

It is not a de Polignac number, because 6720556489 - 2⁷ = 6720556361 is a prime.

It is not a weakly prime, because it can be changed into another prime (6720556289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360278244 + 3360278245.

It is an arithmetic number, because the mean of its divisors is an integer number (3360278245).

Almost surely, 2^6720556489 is an apocalyptic number.

It is an amenable number.

6720556489 is a deficient number, since it is larger than the sum of its proper divisors (1).

6720556489 is an equidigital number, since it uses as much as digits as its factorization.

6720556489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 52.

The square root of 6720556489 is about 81979.0002927579. Note that the first 3 decimals coincide. The cubic root of 6720556489 is about 1887.1296808635.

The spelling of 6720556489 in words is "six billion, seven hundred twenty million, five hundred fifty-six thousand, four hundred eighty-nine".