6643948383 has 12 divisors (see below), whose sum is σ = 10014067440. Its totient is φ = 4236720576.

The previous prime is 6643948349. The next prime is 6643948387. The reversal of 6643948383 is 3838493466.

It is not a de Polignac number, because 6643948383 - 2⁶ = 6643948319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643948387) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16047978 + ... + 16048391.

It is an arithmetic number, because the mean of its divisors is an integer number (834505620).

Almost surely, 2^6643948383 is an apocalyptic number.

6643948383 is a deficient number, since it is larger than the sum of its proper divisors (3370119057).

6643948383 is a wasteful number, since it uses less digits than its factorization.

6643948383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32096398 (or 32096395 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 54.

The square root of 6643948383 is about 81510.4188616400. The cubic root of 6643948383 is about 1879.9317523701.

The spelling of 6643948383 in words is "six billion, six hundred forty-three million, nine hundred forty-eight thousand, three hundred eighty-three".