6720661747 has 2 divisors, whose sum is σ = 6720661748. Its totient is φ = 6720661746.

The previous prime is 6720661699. The next prime is 6720661751. The reversal of 6720661747 is 7471660276.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6720661747 - 2¹⁵ = 6720628979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6720661697 and 6720661706.

It is not a weakly prime, because it can be changed into another prime (6720661777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360330873 + 3360330874.

It is an arithmetic number, because the mean of its divisors is an integer number (3360330874).

Almost surely, 2^6720661747 is an apocalyptic number.

6720661747 is a deficient number, since it is larger than the sum of its proper divisors (1).

6720661747 is an equidigital number, since it uses as much as digits as its factorization.

6720661747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 592704, while the sum is 46.

The square root of 6720661747 is about 81979.6422717250. The cubic root of 6720661747 is about 1887.1395329474.

The spelling of 6720661747 in words is "six billion, seven hundred twenty million, six hundred sixty-one thousand, seven hundred forty-seven".