168140503945 has 4 divisors (see below), whose sum is σ = 201768604740. Its totient is φ = 134512403152.

The previous prime is 168140503903. The next prime is 168140503969. The reversal of 168140503945 is 549305041861.

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 91005995584 + 77134508361 = 301672^2 + 277731^2 .

It is a cyclic number.

It is not a de Polignac number, because 168140503945 - 2¹¹ = 168140501897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 168140503895 and 168140503904.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16814050390 + ... + 16814050399.

It is an arithmetic number, because the mean of its divisors is an integer number (50442151185).

Almost surely, 2^168140503945 is an apocalyptic number.

It is an amenable number.

168140503945 is a deficient number, since it is larger than the sum of its proper divisors (33628100795).

168140503945 is an equidigital number, since it uses as much as digits as its factorization.

168140503945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33628100794.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 168140503945 in words is "one hundred sixty-eight billion, one hundred forty million, five hundred three thousand, nine hundred forty-five".