6663859613640 has 256 divisors, whose sum is σ = 23183677440000. Its totient is φ = 1699397846784.

The previous prime is 6663859613639. The next prime is 6663859613651. The reversal of 6663859613640 is 463169583666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 125142141 + ... + 125195379.

It is an arithmetic number, because the mean of its divisors is an integer number (90561240000).

Almost surely, 2^{6663859613640} is an apocalyptic number.

6663859613640 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 6663859613640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11591838720000).

6663859613640 is an abundant number, since it is smaller than the sum of its proper divisors (16519817826360).

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

6663859613640 is a wasteful number, since it uses less digits than its factorization.

6663859613640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58321 (or 58311 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 63.

The spelling of 6663859613640 in words is "six trillion, six hundred sixty-three billion, eight hundred fifty-nine million, six hundred thirteen thousand, six hundred forty".