3991364843685 has 64 divisors (see below), whose sum is σ = 6771393552384. Its totient is φ = 2004075129600.

The previous prime is 3991364843671. The next prime is 3991364843773. The reversal of 3991364843685 is 5863484631993.

3991364843685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3991364843685 - 2⁶ = 3991364843621 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 148414090 + ... + 148440980.

It is an arithmetic number, because the mean of its divisors is an integer number (105803024256).

Almost surely, 2^{3991364843685} is an apocalyptic number.

It is an amenable number.

3991364843685 is a deficient number, since it is larger than the sum of its proper divisors (2780028708699).

3991364843685 is a wasteful number, since it uses less digits than its factorization.

3991364843685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35594.

The product of its digits is 403107840, while the sum is 69.

The spelling of 3991364843685 in words is "three trillion, nine hundred ninety-one billion, three hundred sixty-four million, eight hundred forty-three thousand, six hundred eighty-five".