6338643993 has 48 divisors (see below), whose sum is σ = 10252412352. Its totient is φ = 3740352000.

The previous prime is 6338643989. The next prime is 6338644003. The reversal of 6338643993 is 3993468336.

It is not a de Polignac number, because 6338643993 - 2² = 6338643989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6338643923) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 2503138 + ... + 2505668.

It is an arithmetic number, because the mean of its divisors is an integer number (213591924).

Almost surely, 2^6338643993 is an apocalyptic number.

It is an amenable number.

6338643993 is a deficient number, since it is larger than the sum of its proper divisors (3913768359).

6338643993 is a wasteful number, since it uses less digits than its factorization.

6338643993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3206 (or 3203 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 54.

The square root of 6338643993 is about 79615.6014421797. The cubic root of 6338643993 is about 1850.6833602080.

The spelling of 6338643993 in words is "six billion, three hundred thirty-eight million, six hundred forty-three thousand, nine hundred ninety-three".