9817979919804 has 36 divisors (see below), whose sum is σ = 28363053102384. Its totient is φ = 2805137119872.

The previous prime is 9817979919773. The next prime is 9817979919823. The reversal of 9817979919804 is 4089199797189.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19480118637 + ... + 19480119140.

Almost surely, 2^{9817979919804} is an apocalyptic number.

It is an amenable number.

9817979919804 is an abundant number, since it is smaller than the sum of its proper divisors (18545073182580).

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

9817979919804 is a wasteful number, since it uses less digits than its factorization.

9817979919804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38960237794 (or 38960237789 counting only the distinct ones).

The product of its (nonzero) digits is 740710656, while the sum is 81.

The spelling of 9817979919804 in words is "nine trillion, eight hundred seventeen billion, nine hundred seventy-nine million, nine hundred nineteen thousand, eight hundred four".