6720841613 has 2 divisors, whose sum is σ = 6720841614. Its totient is φ = 6720841612.

The previous prime is 6720841609. The next prime is 6720841639. The reversal of 6720841613 is 3161480276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4335300649 + 2385540964 = 65843^2 + 48842^2 .

It is a cyclic number.

It is not a de Polignac number, because 6720841613 - 2² = 6720841609 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6720841643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360420806 + 3360420807.

It is an arithmetic number, because the mean of its divisors is an integer number (3360420807).

Almost surely, 2^6720841613 is an apocalyptic number.

It is an amenable number.

6720841613 is a deficient number, since it is larger than the sum of its proper divisors (1).

6720841613 is an equidigital number, since it uses as much as digits as its factorization.

6720841613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 6720841613 is about 81980.7392806384. The cubic root of 6720841613 is about 1887.1563680560.

The spelling of 6720841613 in words is "six billion, seven hundred twenty million, eight hundred forty-one thousand, six hundred thirteen".