168516870505 has 4 divisors (see below), whose sum is σ = 202220244612. Its totient is φ = 134813496400.

The previous prime is 168516870409. The next prime is 168516870569. The reversal of 168516870505 is 505078615861.

It is a happy number.

168516870505 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: 505078615861 = 571 ⋅884550991.

It can be written as a sum of positive squares in 2 ways, for example, as 60756334144 + 107760536361 = 246488^2 + 328269^2 .

It is not a de Polignac number, because 168516870505 - 2¹⁹ = 168516346217 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16851687046 + ... + 16851687055.

It is an arithmetic number, because the mean of its divisors is an integer number (50555061153).

Almost surely, 2^168516870505 is an apocalyptic number.

It is an amenable number.

168516870505 is a deficient number, since it is larger than the sum of its proper divisors (33703374107).

168516870505 is an equidigital number, since it uses as much as digits as its factorization.

168516870505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33703374106.

The product of its (nonzero) digits is 2016000, while the sum is 52.

The spelling of 168516870505 in words is "one hundred sixty-eight billion, five hundred sixteen million, eight hundred seventy thousand, five hundred five".