6445463168 has 32 divisors (see below), whose sum is σ = 13016488260. Its totient is φ = 3178579968.

The previous prime is 6445463149. The next prime is 6445463183. The reversal of 6445463168 is 8613645446.

It can be written as a sum of positive squares in 2 ways, for example, as 6439741504 + 5721664 = 80248^2 + 2392^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 335555 + ... + 354242.

Almost surely, 2^6445463168 is an apocalyptic number.

It is an amenable number.

6445463168 is an abundant number, since it is smaller than the sum of its proper divisors (6571025092).

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

6445463168 is an equidigital number, since it uses as much as digits as its factorization.

6445463168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689884 (or 689872 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 47.

The square root of 6445463168 is about 80283.6419702046. The cubic root of 6445463168 is about 1861.0214422740.

The spelling of 6445463168 in words is "six billion, four hundred forty-five million, four hundred sixty-three thousand, one hundred sixty-eight".