6720841639 has 2 divisors, whose sum is σ = 6720841640. Its totient is φ = 6720841638.

The previous prime is 6720841613. The next prime is 6720841643. The reversal of 6720841639 is 9361480276.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6720841639 - 2²⁵ = 6687287207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6720841609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360420819 + 3360420820.

It is an arithmetic number, because the mean of its divisors is an integer number (3360420820).

Almost surely, 2^6720841639 is an apocalyptic number.

6720841639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6720841639 is an equidigital number, since it uses as much as digits as its factorization.

6720841639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 6720841639 is about 81980.7394392122. The cubic root of 6720841639 is about 1887.1563704895.

The spelling of 6720841639 in words is "six billion, seven hundred twenty million, eight hundred forty-one thousand, six hundred thirty-nine".