1681839381816 has 96 divisors (see below), whose sum is σ = 5020298665200. Its totient is φ = 504394168320.

The previous prime is 1681839381787. The next prime is 1681839381829. The reversal of 1681839381816 is 6181839381861.

1681839381816 is a `hidden beast` number, since 1 + 68 + 1 + 8 + 393 + 8 + 181 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10869231 + ... + 11022878.

Almost surely, 2^{1681839381816} is an apocalyptic number.

It is an amenable number.

1681839381816 is an abundant number, since it is smaller than the sum of its proper divisors (3338459283384).

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

1681839381816 is a wasteful number, since it uses less digits than its factorization.

1681839381816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21892229 (or 21892222 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 63.

The spelling of 1681839381816 in words is "one trillion, six hundred eighty-one billion, eight hundred thirty-nine million, three hundred eighty-one thousand, eight hundred sixteen".