6440053543 has 24 divisors (see below), whose sum is σ = 8565885216. Its totient is φ = 4723023360.

The previous prime is 6440053531. The next prime is 6440053549. The reversal of 6440053543 is 3453500446.

It is not a de Polignac number, because 6440053543 - 2⁹ = 6440053031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6440053499 and 6440053508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440053549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209230 + ... + 238027.

It is an arithmetic number, because the mean of its divisors is an integer number (356911884).

Almost surely, 2^6440053543 is an apocalyptic number.

6440053543 is a deficient number, since it is larger than the sum of its proper divisors (2125831673).

6440053543 is a wasteful number, since it uses less digits than its factorization.

6440053543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447303 (or 447292 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 34.

The square root of 6440053543 is about 80249.9441931270. The cubic root of 6440053543 is about 1860.5006498098.

Adding to 6440053543 its reverse (3453500446), we get a palindrome (9893553989).

The spelling of 6440053543 in words is "six billion, four hundred forty million, fifty-three thousand, five hundred forty-three".