168349144321 has 4 divisors (see below), whose sum is σ = 169479004500. Its totient is φ = 167219284144.

The previous prime is 168349144279. The next prime is 168349144351. The reversal of 168349144321 is 123441943861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123441943861 = 37 ⋅3336268753.

It can be written as a sum of positive squares in 2 ways, for example, as 108830711025 + 59518433296 = 329895^2 + 243964^2 .

It is a cyclic number.

It is not a de Polignac number, because 168349144321 - 2¹³ = 168349136129 is a prime.

It is a super-2 number, since 2×168349144321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168349144351) 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, 564929866 + ... + 564930163.

It is an arithmetic number, because the mean of its divisors is an integer number (42369751125).

Almost surely, 2^168349144321 is an apocalyptic number.

It is an amenable number.

168349144321 is a deficient number, since it is larger than the sum of its proper divisors (1129860179).

168349144321 is a wasteful number, since it uses less digits than its factorization.

168349144321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129860178.

The product of its digits is 497664, while the sum is 46.

The spelling of 168349144321 in words is "one hundred sixty-eight billion, three hundred forty-nine million, one hundred forty-four thousand, three hundred twenty-one".