16681271260866 has 8 divisors (see below), whose sum is σ = 33362542521744. Its totient is φ = 5560423753620.

The previous prime is 16681271260861. The next prime is 16681271260879. The reversal of 16681271260866 is 66806217218661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

16681271260866 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (16681271260861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1390105938400 + ... + 1390105938411.

It is an arithmetic number, because the mean of its divisors is an integer number (4170317815218).

Almost surely, 2^{16681271260866} is an apocalyptic number.

16681271260866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

16681271260866 is a wasteful number, since it uses less digits than its factorization.

16681271260866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780211876816.

The product of its (nonzero) digits is 13934592, while the sum is 60.

The spelling of 16681271260866 in words is "sixteen trillion, six hundred eighty-one billion, two hundred seventy-one million, two hundred sixty thousand, eight hundred sixty-six".