6720556393 has 2 divisors, whose sum is σ = 6720556394. Its totient is φ = 6720556392.

The previous prime is 6720556391. The next prime is 6720556489. The reversal of 6720556393 is 3936550276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6686823529 + 33732864 = 81773^2 + 5808^2 .

It is a cyclic number.

It is not a de Polignac number, because 6720556393 - 2¹ = 6720556391 is a prime.

Together with 6720556391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6720556391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360278196 + 3360278197.

It is an arithmetic number, because the mean of its divisors is an integer number (3360278197).

Almost surely, 2^6720556393 is an apocalyptic number.

It is an amenable number.

6720556393 is a deficient number, since it is larger than the sum of its proper divisors (1).

6720556393 is an equidigital number, since it uses as much as digits as its factorization.

6720556393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1020600, while the sum is 46.

The square root of 6720556393 is about 81978.9997072421. Note that the first 3 decimals coincide. The cubic root of 6720556393 is about 1887.1296718779.

The spelling of 6720556393 in words is "six billion, seven hundred twenty million, five hundred fifty-six thousand, three hundred ninety-three".