6681854581866 has 96 divisors (see below), whose sum is σ = 14777412249600. Its totient is φ = 2181408809760.

The previous prime is 6681854581793. The next prime is 6681854581867.

6681854581866 is a `hidden beast` number, since 6 + 6 + 8 + 1 + 8 + 545 + 8 + 18 + 66 = 666.

6681854581866 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6681854581794 and 6681854581803.

It is not an unprimeable number, because it can be changed into a prime (6681854581867) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1153831431 + ... + 1153837221.

It is an arithmetic number, because the mean of its divisors is an integer number (153931377600).

Almost surely, 2^{6681854581866} is an apocalyptic number.

6681854581866 is an abundant number, since it is smaller than the sum of its proper divisors (8095557667734).

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

6681854581866 is a wasteful number, since it uses less digits than its factorization.

6681854581866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9704 (or 9701 counting only the distinct ones).

The product of its digits is 530841600, while the sum is 72.

The spelling of 6681854581866 in words is "six trillion, six hundred eighty-one billion, eight hundred fifty-four million, five hundred eighty-one thousand, eight hundred sixty-six".