6645956832 has 144 divisors (see below), whose sum is σ = 19315951200. Its totient is φ = 2166912000.

The previous prime is 6645956803. The next prime is 6645956833. The reversal of 6645956832 is 2386595466.

6645956832 is a `hidden beast` number, since 6 + 6 + 45 + 9 + 568 + 32 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645956833) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3495082 + ... + 3496982.

It is an arithmetic number, because the mean of its divisors is an integer number (134138550).

Almost surely, 2^6645956832 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6645956832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9657975600).

6645956832 is an abundant number, since it is smaller than the sum of its proper divisors (12669994368).

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

6645956832 is a wasteful number, since it uses less digits than its factorization.

6645956832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177 (or 2166 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 54.

The square root of 6645956832 is about 81522.7381286963. The cubic root of 6645956832 is about 1880.1211661759.

The spelling of 6645956832 in words is "six billion, six hundred forty-five million, nine hundred fifty-six thousand, eight hundred thirty-two".