6681536616 has 48 divisors (see below), whose sum is σ = 17461704960. Its totient is φ = 2130340960.

The previous prime is 6681536611. The next prime is 6681536633. The reversal of 6681536616 is 6166351866.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6681536611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250440 + ... + 275831.

It is an arithmetic number, because the mean of its divisors is an integer number (363785520).

Almost surely, 2^6681536616 is an apocalyptic number.

It is an amenable number.

6681536616 is an abundant number, since it is smaller than the sum of its proper divisors (10780168344).

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

6681536616 is a wasteful number, since it uses less digits than its factorization.

6681536616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526326 (or 526299 counting only the distinct ones).

The product of its digits is 933120, while the sum is 48.

The square root of 6681536616 is about 81740.6668433773. Note that the first 3 decimals coincide. The cubic root of 6681536616 is about 1883.4703344686.

The spelling of 6681536616 in words is "six billion, six hundred eighty-one million, five hundred thirty-six thousand, six hundred sixteen".