6643922208 has 288 divisors, whose sum is σ = 22152735360. Its totient is φ = 1706496000.

The previous prime is 6643922191. The next prime is 6643922227. The reversal of 6643922208 is 8022293466.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 6643922208.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8212108 + ... + 8212916.

It is an arithmetic number, because the mean of its divisors is an integer number (76919220).

Almost surely, 2^6643922208 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 6643922208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11076367680).

6643922208 is an abundant number, since it is smaller than the sum of its proper divisors (15508813152).

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

6643922208 is a wasteful number, since it uses less digits than its factorization.

6643922208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952 (or 933 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 6643922208 is about 81510.2582991859. The cubic root of 6643922208 is about 1879.9292835932.

The spelling of 6643922208 in words is "six billion, six hundred forty-three million, nine hundred twenty-two thousand, two hundred eight".