6543320436 has 36 divisors (see below), whose sum is σ = 16558141600. Its totient is φ = 2178722448.

The previous prime is 6543320423. The next prime is 6543320447. The reversal of 6543320436 is 6340233456.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6543320436.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65806 + ... + 131973.

Almost surely, 2^6543320436 is an apocalyptic number.

It is an amenable number.

6543320436 is an abundant number, since it is smaller than the sum of its proper divisors (10014821164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6543320436 is a wasteful number, since it uses less digits than its factorization.

6543320436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198708 (or 198703 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 36.

The square root of 6543320436 is about 80890.7932709279. The cubic root of 6543320436 is about 1870.3924020433.

The spelling of 6543320436 in words is "six billion, five hundred forty-three million, three hundred twenty thousand, four hundred thirty-six".