6564443540 has 12 divisors (see below), whose sum is σ = 13785331476. Its totient is φ = 2625777408.

The previous prime is 6564443531. The next prime is 6564443581. The reversal of 6564443540 is 453444656.

It can be written as a sum of positive squares in 2 ways, for example, as 3161587984 + 3402855556 = 56228^2 + 58334^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164111069 + ... + 164111108.

It is an arithmetic number, because the mean of its divisors is an integer number (1148777623).

Almost surely, 2^6564443540 is an apocalyptic number.

It is an amenable number.

6564443540 is an abundant number, since it is smaller than the sum of its proper divisors (7220887936).

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

6564443540 is a wasteful number, since it uses less digits than its factorization.

6564443540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328222186 (or 328222184 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 41.

The square root of 6564443540 is about 81021.2536313775. The cubic root of 6564443540 is about 1872.4029029814.

The spelling of 6564443540 in words is "six billion, five hundred sixty-four million, four hundred forty-three thousand, five hundred forty".