6720707009 has 2 divisors, whose sum is σ = 6720707010. Its totient is φ = 6720707008.

The previous prime is 6720706957. The next prime is 6720707033. The reversal of 6720707009 is 9007070276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3981231409 + 2739475600 = 63097^2 + 52340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6720707009 is a prime.

It is not a weakly prime, because it can be changed into another prime (6720707089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360353504 + 3360353505.

It is an arithmetic number, because the mean of its divisors is an integer number (3360353505).

Almost surely, 2^6720707009 is an apocalyptic number.

It is an amenable number.

6720707009 is a deficient number, since it is larger than the sum of its proper divisors (1).

6720707009 is an equidigital number, since it uses as much as digits as its factorization.

6720707009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37044, while the sum is 38.

The square root of 6720707009 is about 81979.9183276002. The cubic root of 6720707009 is about 1887.1437694111.

The spelling of 6720707009 in words is "six billion, seven hundred twenty million, seven hundred seven thousand, nine".