6543665814 has 32 divisors (see below), whose sum is σ = 15439435776. Its totient is φ = 1809308160.

The previous prime is 6543665813. The next prime is 6543665833. The reversal of 6543665814 is 4185663456.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543665813) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2511627 + ... + 2514230.

It is an arithmetic number, because the mean of its divisors is an integer number (482482368).

Almost surely, 2^6543665814 is an apocalyptic number.

6543665814 is an abundant number, since it is smaller than the sum of its proper divisors (8895769962).

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

6543665814 is a wasteful number, since it uses less digits than its factorization.

6543665814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5025900.

The product of its digits is 2073600, while the sum is 48.

The square root of 6543665814 is about 80892.9280839802. The cubic root of 6543665814 is about 1870.4253099544.

The spelling of 6543665814 in words is "six billion, five hundred forty-three million, six hundred sixty-five thousand, eight hundred fourteen".