6663843648 has 672 divisors, whose sum is σ = 25620268800. Its totient is φ = 1660538880.

The previous prime is 6663843631. The next prime is 6663843701. The reversal of 6663843648 is 8463483666.

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 6663843594 and 6663843603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 42444786 + ... + 42444942.

It is an arithmetic number, because the mean of its divisors is an integer number (38125400).

Almost surely, 2^6663843648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6663843648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12810134400).

6663843648 is an abundant number, since it is smaller than the sum of its proper divisors (18956425152).

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

6663843648 is a wasteful number, since it uses less digits than its factorization.

6663843648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 209 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 54.

The square root of 6663843648 is about 81632.3688741176. The cubic root of 6663843648 is about 1881.8063640281.

The spelling of 6663843648 in words is "six billion, six hundred sixty-three million, eight hundred forty-three thousand, six hundred forty-eight".