168540843502073 has 4 divisors (see below), whose sum is σ = 192618106859520. Its totient is φ = 144463580144628.

The previous prime is 168540843502069. The next prime is 168540843502079. The reversal of 168540843502073 is 370205348045861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 168540843502073 - 2² = 168540843502069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (168540843502079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12038631678713 + ... + 12038631678726.

It is an arithmetic number, because the mean of its divisors is an integer number (48154526714880).

Almost surely, 2^{168540843502073} is an apocalyptic number.

It is an amenable number.

168540843502073 is a deficient number, since it is larger than the sum of its proper divisors (24077263357447).

168540843502073 is an equidigital number, since it uses as much as digits as its factorization.

168540843502073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24077263357446.

The product of its (nonzero) digits is 19353600, while the sum is 56.

The spelling of 168540843502073 in words is "one hundred sixty-eight trillion, five hundred forty billion, eight hundred forty-three million, five hundred two thousand, seventy-three".