6643121424 has 40 divisors (see below), whose sum is σ = 17217335520. Its totient is φ = 2207155968.

The previous prime is 6643121417. The next prime is 6643121431. The reversal of 6643121424 is 4241213466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6643121417) and next prime (6643121431).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210669 + ... + 240140.

It is an arithmetic number, because the mean of its divisors is an integer number (430433388).

Almost surely, 2^6643121424 is an apocalyptic number.

It is an amenable number.

6643121424 is an abundant number, since it is smaller than the sum of its proper divisors (10574214096).

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

6643121424 is a wasteful number, since it uses less digits than its factorization.

6643121424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451127 (or 451121 counting only the distinct ones).

The product of its digits is 27648, while the sum is 33.

The square root of 6643121424 is about 81505.3459841746. The cubic root of 6643121424 is about 1879.8537520156.

The spelling of 6643121424 in words is "six billion, six hundred forty-three million, one hundred twenty-one thousand, four hundred twenty-four".