6448963872389 has 4 divisors (see below), whose sum is σ = 6448969088556. Its totient is φ = 6448958656224.

The previous prime is 6448963872383. The next prime is 6448963872497. The reversal of 6448963872389 is 9832783698446.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1758230916289 + 4690732956100 = 1325983^2 + 2165810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6448963872389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6448963872383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412667 + ... + 3614999.

It is an arithmetic number, because the mean of its divisors is an integer number (1612242272139).

Almost surely, 2^{6448963872389} is an apocalyptic number.

It is an amenable number.

6448963872389 is a deficient number, since it is larger than the sum of its proper divisors (5216167).

6448963872389 is a wasteful number, since it uses less digits than its factorization.

6448963872389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5216166.

The product of its digits is 3009871872, while the sum is 77.

The spelling of 6448963872389 in words is "six trillion, four hundred forty-eight billion, nine hundred sixty-three million, eight hundred seventy-two thousand, three hundred eighty-nine".