1681816382444 has 12 divisors (see below), whose sum is σ = 3210740366568. Its totient is φ = 764461992000.

The previous prime is 1681816382359. The next prime is 1681816382461. The reversal of 1681816382444 is 4442836181861.

It is a self number, because there is not a number n which added to its sum of digits gives 1681816382444.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19111549757 + ... + 19111549844.

It is an arithmetic number, because the mean of its divisors is an integer number (267561697214).

Almost surely, 2^{1681816382444} is an apocalyptic number.

It is an amenable number.

1681816382444 is a deficient number, since it is larger than the sum of its proper divisors (1528923984124).

1681816382444 is a wasteful number, since it uses less digits than its factorization.

1681816382444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38223099616 (or 38223099614 counting only the distinct ones).

The product of its digits is 7077888, while the sum is 56.

The spelling of 1681816382444 in words is "one trillion, six hundred eighty-one billion, eight hundred sixteen million, three hundred eighty-two thousand, four hundred forty-four".