6642208444 has 24 divisors (see below), whose sum is σ = 11913350400. Its totient is φ = 3238475520.

The previous prime is 6642208429. The next prime is 6642208453. The reversal of 6642208444 is 4448022466.

It is a happy number.

It is a super-2 number, since 2×6642208444² = 88237866027089802272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6642208397 and 6642208406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358152 + ... + 376240.

It is an arithmetic number, because the mean of its divisors is an integer number (496389600).

Almost surely, 2^6642208444 is an apocalyptic number.

It is an amenable number.

6642208444 is a deficient number, since it is larger than the sum of its proper divisors (5271141956).

6642208444 is a wasteful number, since it uses less digits than its factorization.

6642208444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20373 (or 20371 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 40.

The square root of 6642208444 is about 81499.7450548160. The cubic root of 6642208444 is about 1879.7676304773.

The spelling of 6642208444 in words is "six billion, six hundred forty-two million, two hundred eight thousand, four hundred forty-four".