6720689567 has 2 divisors, whose sum is σ = 6720689568. Its totient is φ = 6720689566.

The previous prime is 6720689561. The next prime is 6720689623. The reversal of 6720689567 is 7659860276.

It is an a-pointer prime, because the next prime (6720689623) can be obtained adding 6720689567 to its sum of digits (56).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6720689567 - 2¹⁰ = 6720688543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6720689561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360344783 + 3360344784.

It is an arithmetic number, because the mean of its divisors is an integer number (3360344784).

Almost surely, 2^6720689567 is an apocalyptic number.

6720689567 is a deficient number, since it is larger than the sum of its proper divisors (1).

6720689567 is an equidigital number, since it uses as much as digits as its factorization.

6720689567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The square root of 6720689567 is about 81979.8119478204. The cubic root of 6720689567 is about 1887.1421368651.

The spelling of 6720689567 in words is "six billion, seven hundred twenty million, six hundred eighty-nine thousand, five hundred sixty-seven".