19873293985 has 4 divisors (see below), whose sum is σ = 23847952788. Its totient is φ = 15898635184.

The previous prime is 19873293949. The next prime is 19873294033. The reversal of 19873293985 is 58939237891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15118915681 + 4754378304 = 122959^2 + 68952^2 .

It is a cyclic number.

It is not a de Polignac number, because 19873293985 - 2¹¹ = 19873291937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1987329394 + ... + 1987329403.

It is an arithmetic number, because the mean of its divisors is an integer number (5961988197).

Almost surely, 2^19873293985 is an apocalyptic number.

It is an amenable number.

19873293985 is a deficient number, since it is larger than the sum of its proper divisors (3974658803).

19873293985 is an equidigital number, since it uses as much as digits as its factorization.

19873293985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3974658802.

The product of its digits is 29393280, while the sum is 64.

The spelling of 19873293985 in words is "nineteen billion, eight hundred seventy-three million, two hundred ninety-three thousand, nine hundred eighty-five".