6643296398 has 4 divisors (see below), whose sum is σ = 9964944600. Its totient is φ = 3321648198.

The previous prime is 6643296391. The next prime is 6643296403. The reversal of 6643296398 is 8936923466.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643296391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660824098 + ... + 1660824101.

It is an arithmetic number, because the mean of its divisors is an integer number (2491236150).

Almost surely, 2^6643296398 is an apocalyptic number.

6643296398 is a deficient number, since it is larger than the sum of its proper divisors (3321648202).

6643296398 is a wasteful number, since it uses less digits than its factorization.

6643296398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3321648201.

The product of its digits is 10077696, while the sum is 56.

The square root of 6643296398 is about 81506.4193668204. The cubic root of 6643296398 is about 1879.8702564379.

The spelling of 6643296398 in words is "six billion, six hundred forty-three million, two hundred ninety-six thousand, three hundred ninety-eight".