6438448873 has 2 divisors, whose sum is σ = 6438448874. Its totient is φ = 6438448872.

The previous prime is 6438448853. The next prime is 6438448943. The reversal of 6438448873 is 3788448346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4781307609 + 1657141264 = 69147^2 + 40708^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6438448873 is a prime.

It is not a weakly prime, because it can be changed into another prime (6438448853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3219224436 + 3219224437.

It is an arithmetic number, because the mean of its divisors is an integer number (3219224437).

Almost surely, 2^6438448873 is an apocalyptic number.

It is an amenable number.

6438448873 is a deficient number, since it is larger than the sum of its proper divisors (1).

6438448873 is an equidigital number, since it uses as much as digits as its factorization.

6438448873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12386304, while the sum is 55.

The square root of 6438448873 is about 80239.9456193734. The cubic root of 6438448873 is about 1860.3461098122.

The spelling of 6438448873 in words is "six billion, four hundred thirty-eight million, four hundred forty-eight thousand, eight hundred seventy-three".