6645544708903 has 4 divisors (see below), whose sum is σ = 6663079128040. Its totient is φ = 6628010289768.

The previous prime is 6645544708889. The next prime is 6645544708927. The reversal of 6645544708903 is 3098074455466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6645544708903 - 2²¹ = 6645542611751 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 (6645544708403) 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, 8767209000 + ... + 8767209757.

It is an arithmetic number, because the mean of its divisors is an integer number (1665769782010).

Almost surely, 2^{6645544708903} is an apocalyptic number.

6645544708903 is a deficient number, since it is larger than the sum of its proper divisors (17534419137).

6645544708903 is a wasteful number, since it uses less digits than its factorization.

6645544708903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17534419136.

The product of its (nonzero) digits is 87091200, while the sum is 61.

The spelling of 6645544708903 in words is "six trillion, six hundred forty-five billion, five hundred forty-four million, seven hundred eight thousand, nine hundred three".