6643650648 has 64 divisors (see below), whose sum is σ = 17342265600. Its totient is φ = 2116920960.

The previous prime is 6643650631. The next prime is 6643650661. The reversal of 6643650648 is 8460563466.

It is a junction number, because it is equal to n+sod(n) for n = 6643650597 and 6643650606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1223283 + ... + 1228701.

It is an arithmetic number, because the mean of its divisors is an integer number (270972900).

Almost surely, 2^6643650648 is an apocalyptic number.

It is an amenable number.

6643650648 is an abundant number, since it is smaller than the sum of its proper divisors (10698614952).

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

6643650648 is a wasteful number, since it uses less digits than its factorization.

6643650648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7672 (or 7668 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 48.

The square root of 6643650648 is about 81508.5924795662. The cubic root of 6643650648 is about 1879.9036701812.

The spelling of 6643650648 in words is "six billion, six hundred forty-three million, six hundred fifty thousand, six hundred forty-eight".