1996386904985 has 16 divisors (see below), whose sum is σ = 2613913364160. Its totient is φ = 1451661407040.

The previous prime is 1996386904979. The next prime is 1996386905021. The reversal of 1996386904985 is 5894096836991.

It is not a de Polignac number, because 1996386904985 - 2¹⁸ = 1996386642841 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2889647 + ... + 3513236.

It is an arithmetic number, because the mean of its divisors is an integer number (163369585260).

Almost surely, 2^{1996386904985} is an apocalyptic number.

It is an amenable number.

1996386904985 is a deficient number, since it is larger than the sum of its proper divisors (617526459175).

1996386904985 is a wasteful number, since it uses less digits than its factorization.

1996386904985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6408568.

The product of its (nonzero) digits is 906992640, while the sum is 77.

The spelling of 1996386904985 in words is "one trillion, nine hundred ninety-six billion, three hundred eighty-six million, nine hundred four thousand, nine hundred eighty-five".