16985436805 has 4 divisors (see below), whose sum is σ = 20382524172. Its totient is φ = 13588349440.

The previous prime is 16985436803. The next prime is 16985436823. The reversal of 16985436805 is 50863458961.

16985436805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50863458961 = 7 ⋅7266208423.

It can be written as a sum of positive squares in 2 ways, for example, as 4566786084 + 12418650721 = 67578^2 + 111439^2 .

It is not a de Polignac number, because 16985436805 - 2¹ = 16985436803 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 (16985436803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1698543676 + ... + 1698543685.

It is an arithmetic number, because the mean of its divisors is an integer number (5095631043).

Almost surely, 2^16985436805 is an apocalyptic number.

It is an amenable number.

16985436805 is a deficient number, since it is larger than the sum of its proper divisors (3397087367).

16985436805 is an equidigital number, since it uses as much as digits as its factorization.

16985436805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3397087366.

The product of its (nonzero) digits is 6220800, while the sum is 55.

The spelling of 16985436805 in words is "sixteen billion, nine hundred eighty-five million, four hundred thirty-six thousand, eight hundred five".