6443521416 has 24 divisors (see below), whose sum is σ = 17451204030. Its totient is φ = 2147840448.

The previous prime is 6443521367. The next prime is 6443521417. The reversal of 6443521416 is 6141253446.

6443521416 is a `hidden beast` number, since 6 + 4 + 435 + 214 + 1 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3987922500 + 2455598916 = 63150^2 + 49554^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (6443521417) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44746605 + ... + 44746748.

Almost surely, 2^6443521416 is an apocalyptic number.

It is an amenable number.

6443521416 is an abundant number, since it is smaller than the sum of its proper divisors (11007682614).

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

6443521416 is a wasteful number, since it uses less digits than its factorization.

6443521416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89493365 (or 89493358 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 6443521416 is about 80271.5479855721. The cubic root of 6443521416 is about 1860.8345405234.

The spelling of 6443521416 in words is "six billion, four hundred forty-three million, five hundred twenty-one thousand, four hundred sixteen".