6438635873 has 2 divisors, whose sum is σ = 6438635874. Its totient is φ = 6438635872.

The previous prime is 6438635813. The next prime is 6438635911. The reversal of 6438635873 is 3785368346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6175287889 + 263347984 = 78583^2 + 16228^2 .

It is a cyclic number.

It is not a de Polignac number, because 6438635873 - 2⁶ = 6438635809 is a prime.

It is not a weakly prime, because it can be changed into another prime (6438635813) 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, 3219317936 + 3219317937.

It is an arithmetic number, because the mean of its divisors is an integer number (3219317937).

Almost surely, 2^6438635873 is an apocalyptic number.

It is an amenable number.

6438635873 is a deficient number, since it is larger than the sum of its proper divisors (1).

6438635873 is an equidigital number, since it uses as much as digits as its factorization.

6438635873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 53.

The square root of 6438635873 is about 80241.1108659395. The cubic root of 6438635873 is about 1860.3641204315.

The spelling of 6438635873 in words is "six billion, four hundred thirty-eight million, six hundred thirty-five thousand, eight hundred seventy-three".