168275218 has 4 divisors (see below), whose sum is σ = 252412830. Its totient is φ = 84137608.

The previous prime is 168275213. The next prime is 168275227. The reversal of 168275218 is 812572861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812572861 = 349 ⋅2328289.

It can be written as a sum of positive squares in only one way, i.e., 164019249 + 4255969 = 12807^2 + 2063^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (168275213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42068803 + ... + 42068806.

Almost surely, 2^168275218 is an apocalyptic number.

168275218 is a deficient number, since it is larger than the sum of its proper divisors (84137612).

168275218 is an equidigital number, since it uses as much as digits as its factorization.

168275218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84137611.

The product of its digits is 53760, while the sum is 40.

The square root of 168275218 is about 12972.0938171137. The cubic root of 168275218 is about 552.0859826329.

The spelling of 168275218 in words is "one hundred sixty-eight million, two hundred seventy-five thousand, two hundred eighteen".