168350185181 has 4 divisors (see below), whose sum is σ = 168360582492. Its totient is φ = 168339787872.

The previous prime is 168350185109. The next prime is 168350185189. The reversal of 168350185181 is 181581053861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181581053861 = 67 ⋅2710164983.

It can be written as a sum of positive squares in 2 ways, for example, as 50834917156 + 117515268025 = 225466^2 + 342805^2 .

It is a cyclic number.

It is not a de Polignac number, because 168350185181 - 2²² = 168345990877 is a prime.

It is a super-2 number, since 2×168350185181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168350185189) 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, 5174330 + ... + 5206763.

It is an arithmetic number, because the mean of its divisors is an integer number (42090145623).

Almost surely, 2^168350185181 is an apocalyptic number.

It is an amenable number.

168350185181 is a deficient number, since it is larger than the sum of its proper divisors (10397311).

168350185181 is a wasteful number, since it uses less digits than its factorization.

168350185181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10397310.

The product of its (nonzero) digits is 230400, while the sum is 47.

The spelling of 168350185181 in words is "one hundred sixty-eight billion, three hundred fifty million, one hundred eighty-five thousand, one hundred eighty-one".