6544306891604 has 12 divisors (see below), whose sum is σ = 11453617460628. Its totient is φ = 3271844760000.

The previous prime is 6544306891601. The next prime is 6544306891609. The reversal of 6544306891604 is 4061986034456.

It can be written as a sum of positive squares in 2 ways, for example, as 5002612169104 + 1541694722500 = 2236652^2 + 1241650^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6544306891604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6544306891601) 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, 77123747 + ... + 77208554.

It is an arithmetic number, because the mean of its divisors is an integer number (954468121719).

Almost surely, 2^{6544306891604} is an apocalyptic number.

It is an amenable number.

6544306891604 is a deficient number, since it is larger than the sum of its proper divisors (4909310569024).

6544306891604 is a wasteful number, since it uses less digits than its factorization.

6544306891604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154342906 (or 154342904 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 56.

The spelling of 6544306891604 in words is "six trillion, five hundred forty-four billion, three hundred six million, eight hundred ninety-one thousand, six hundred four".