6644660000 has 120 divisors (see below), whose sum is σ = 17833528944. Its totient is φ = 2416160000.

The previous prime is 6644659991. The next prime is 6644660023. The reversal of 6644660000 is 664466.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 204899 + ... + 235101.

Almost surely, 2^6644660000 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 6644660000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8916764472).

6644660000 is an abundant number, since it is smaller than the sum of its proper divisors (11188868944).

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

6644660000 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (6644659999) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (30221).

6644660000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30244 (or 30221 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 6644660000 is about 81514.7839351856. The cubic root of 6644660000 is about 1879.9988682655.

6644660000 divided by its reverse (664466) gives a 4-th power (10000 = 10⁴).

It can be divided in two parts, 664 and 4660000, that added together give a palindrome (4660664).

The spelling of 6644660000 in words is "six billion, six hundred forty-four million, six hundred sixty thousand".