6544040439 has 16 divisors (see below), whose sum is σ = 9189417600. Its totient is φ = 4130918496.

The previous prime is 6544040423. The next prime is 6544040453. The reversal of 6544040439 is 9340404456.

It is not a de Polignac number, because 6544040439 - 2⁴ = 6544040423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6544040397 and 6544040406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6544000439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83797 + ... + 141809.

It is an arithmetic number, because the mean of its divisors is an integer number (574338600).

Almost surely, 2^6544040439 is an apocalyptic number.

6544040439 is a deficient number, since it is larger than the sum of its proper divisors (2645377161).

6544040439 is a wasteful number, since it uses less digits than its factorization.

6544040439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60014.

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 6544040439 is about 80895.2436117229. The cubic root of 6544040439 is about 1870.4610032355.

It can be divided in two parts, 6 and 544040439, that added together give a palindrome (544040445).

The spelling of 6544040439 in words is "six billion, five hundred forty-four million, forty thousand, four hundred thirty-nine".