6445671287439 has 8 divisors (see below), whose sum is σ = 8618167739520. Its totient is φ = 4285144513496.

The previous prime is 6445671287413. The next prime is 6445671287521. The reversal of 6445671287439 is 9347821765446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6445671287439 - 2²⁴ = 6445654510223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6445671287439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445671287239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2992418277 + ... + 2992420430.

It is an arithmetic number, because the mean of its divisors is an integer number (1077270967440).

Almost surely, 2^{6445671287439} is an apocalyptic number.

6445671287439 is a deficient number, since it is larger than the sum of its proper divisors (2172496452081).

6445671287439 is a wasteful number, since it uses less digits than its factorization.

6445671287439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5984839069.

The product of its digits is 243855360, while the sum is 66.

The spelling of 6445671287439 in words is "six trillion, four hundred forty-five billion, six hundred seventy-one million, two hundred eighty-seven thousand, four hundred thirty-nine".