6443218408 has 16 divisors (see below), whose sum is σ = 13179310560. Its totient is φ = 2928735600.

The previous prime is 6443218403. The next prime is 6443218417. The reversal of 6443218408 is 8048123446.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6443218403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36609108 + ... + 36609283.

It is an arithmetic number, because the mean of its divisors is an integer number (823706910).

Almost surely, 2^6443218408 is an apocalyptic number.

It is an amenable number.

6443218408 is an abundant number, since it is smaller than the sum of its proper divisors (6736092152).

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

6443218408 is a wasteful number, since it uses less digits than its factorization.

6443218408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73218408 (or 73218404 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 6443218408 is about 80269.6605698567. The cubic root of 6443218408 is about 1860.8053713494.

The spelling of 6443218408 in words is "six billion, four hundred forty-three million, two hundred eighteen thousand, four hundred eight".