6681996445680 has 140 divisors (see below), whose sum is σ = 23292807360600. Its totient is φ = 1781865703296.

The previous prime is 6681996445669. The next prime is 6681996445693. The reversal of 6681996445680 is 865446991866.

6681996445680 is a `hidden beast` number, since 6 + 6 + 8 + 1 + 9 + 96 + 4 + 456 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 6681996445599 and 6681996445608.

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 27 ways as a sum of consecutive naturals, for example, 57229030 + ... + 57345669.

Almost surely, 2^{6681996445680} is an apocalyptic number.

6681996445680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6681996445680 is an abundant number, since it is smaller than the sum of its proper divisors (16610810914920).

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

6681996445680 is a wasteful number, since it uses less digits than its factorization.

6681996445680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114574730 (or 114574709 counting only the distinct ones).

The product of its (nonzero) digits is 537477120, while the sum is 72.

The spelling of 6681996445680 in words is "six trillion, six hundred eighty-one billion, nine hundred ninety-six million, four hundred forty-five thousand, six hundred eighty".