168520018 has 8 divisors (see below), whose sum is σ = 252927612. Its totient is φ = 84210816.

The previous prime is 168520013. The next prime is 168520039. The reversal of 168520018 is 810025861.

It can be written as a sum of positive squares in 2 ways, for example, as 161213809 + 7306209 = 12697^2 + 2703^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (168520013) 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, 20155 + ... + 27262.

Almost surely, 2^168520018 is an apocalyptic number.

168520018 is a deficient number, since it is larger than the sum of its proper divisors (84407594).

168520018 is a wasteful number, since it uses less digits than its factorization.

168520018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49196.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 168520018 is about 12981.5260273975. The cubic root of 168520018 is about 552.3535703895.

Adding to 168520018 its reverse (810025861), we get a palindrome (978545879).

The spelling of 168520018 in words is "one hundred sixty-eight million, five hundred twenty thousand, eighteen".