1993849868813 has 16 divisors (see below), whose sum is σ = 2270037657600. Its totient is φ = 1733508445680.

The previous prime is 1993849868797. The next prime is 1993849868821. The reversal of 1993849868813 is 3188689483991.

It is not a de Polignac number, because 1993849868813 - 2⁴ = 1993849868797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1993849868833) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 989168 + ... + 2228486.

It is an arithmetic number, because the mean of its divisors is an integer number (141877353600).

Almost surely, 2^{1993849868813} is an apocalyptic number.

It is an amenable number.

1993849868813 is a deficient number, since it is larger than the sum of its proper divisors (276187788787).

1993849868813 is a wasteful number, since it uses less digits than its factorization.

1993849868813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245712.

The product of its digits is 644972544, while the sum is 77.

The spelling of 1993849868813 in words is "one trillion, nine hundred ninety-three billion, eight hundred forty-nine million, eight hundred sixty-eight thousand, eight hundred thirteen".