6640222000 has 80 divisors (see below), whose sum is σ = 16098424992. Its totient is φ = 2649081600.

The previous prime is 6640221989. The next prime is 6640222013. The reversal of 6640222000 is 2220466.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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, 789819 + ... + 798181.

Almost surely, 2^6640222000 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 6640222000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8049212496).

6640222000 is an abundant number, since it is smaller than the sum of its proper divisors (9458202992).

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

6640222000 is a wasteful number, since it uses less digits than its factorization.

6640222000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8783 (or 8767 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 6640222000 is about 81487.5573323928. The cubic root of 6640222000 is about 1879.5802216527.

Adding to 6640222000 its reverse (2220466), we get a palindrome (6642442466).

The spelling of 6640222000 in words is "six billion, six hundred forty million, two hundred twenty-two thousand".