6639909606 has 288 divisors, whose sum is σ = 18110705760. Its totient is φ = 1795368960.

The previous prime is 6639909587. The next prime is 6639909611. The reversal of 6639909606 is 6069099366.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 143 ways as a sum of consecutive naturals, for example, 58760206 + ... + 58760318.

It is an arithmetic number, because the mean of its divisors is an integer number (62884395).

Almost surely, 2^6639909606 is an apocalyptic number.

6639909606 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 6639909606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9055352880).

6639909606 is an abundant number, since it is smaller than the sum of its proper divisors (11470796154).

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

6639909606 is a wasteful number, since it uses less digits than its factorization.

6639909606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 2834352, while the sum is 54.

The square root of 6639909606 is about 81485.6404895979. The cubic root of 6639909606 is about 1879.5507457912.

The spelling of 6639909606 in words is "six billion, six hundred thirty-nine million, nine hundred nine thousand, six hundred six".