6643488852 has 576 divisors, whose sum is σ = 24578211840. Its totient is φ = 1455667200.

The previous prime is 6643488823. The next prime is 6643488893. The reversal of 6643488852 is 2588843466.

It is a super-3 number, since 3×6643488852³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 21225048 + ... + 21225360.

Almost surely, 2^6643488852 is an apocalyptic number.

6643488852 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6643488852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12289105920).

6643488852 is an abundant number, since it is smaller than the sum of its proper divisors (17934722988).

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

6643488852 is a wasteful number, since it uses less digits than its factorization.

6643488852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 399 counting only the distinct ones).

The product of its digits is 8847360, while the sum is 54.

The square root of 6643488852 is about 81507.5999646659. The cubic root of 6643488852 is about 1879.8884093264. Note that the first 3 decimals are identical.

The spelling of 6643488852 in words is "six billion, six hundred forty-three million, four hundred eighty-eight thousand, eight hundred fifty-two".