6639669330840 has 1024 divisors, whose sum is σ = 28169551872000. Its totient is φ = 1353240483840.

The previous prime is 6639669330803. The next prime is 6639669330869. The reversal of 6639669330840 is 480339669366.

It is a Harshad number since it is a multiple of its sum of digits (63).

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 255 ways as a sum of consecutive naturals, for example, 2007760467 + ... + 2007763773.

It is an arithmetic number, because the mean of its divisors is an integer number (27509328000).

Almost surely, 2^{6639669330840} is an apocalyptic number.

6639669330840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6639669330840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14084775936000).

6639669330840 is an abundant number, since it is smaller than the sum of its proper divisors (21529882541160).

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

6639669330840 is a wasteful number, since it uses less digits than its factorization.

6639669330840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4037 (or 4027 counting only the distinct ones).

The product of its (nonzero) digits is 90699264, while the sum is 63.

The spelling of 6639669330840 in words is "six trillion, six hundred thirty-nine billion, six hundred sixty-nine million, three hundred thirty thousand, eight hundred forty".