168917998045 has 4 divisors (see below), whose sum is σ = 202701597660. Its totient is φ = 135134398432.

The previous prime is 168917998027. The next prime is 168917998157. The reversal of 168917998045 is 540899719861.

168917998045 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: 540899719861 = 419 ⋅1290930119.

It can be written as a sum of positive squares in 2 ways, for example, as 20776916164 + 148141081881 = 144142^2 + 384891^2 .

It is a cyclic number.

It is not a de Polignac number, because 168917998045 - 2¹¹ = 168917995997 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent 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, 16891799800 + ... + 16891799809.

It is an arithmetic number, because the mean of its divisors is an integer number (50675399415).

Almost surely, 2^168917998045 is an apocalyptic number.

It is an amenable number.

168917998045 is a deficient number, since it is larger than the sum of its proper divisors (33783599615).

168917998045 is an equidigital number, since it uses as much as digits as its factorization.

168917998045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33783599614.

The product of its (nonzero) digits is 39191040, while the sum is 67.

The spelling of 168917998045 in words is "one hundred sixty-eight billion, nine hundred seventeen million, nine hundred ninety-eight thousand, forty-five".