166640018 has 8 divisors (see below), whose sum is σ = 264663612. Its totient is φ = 78418816.

The previous prime is 166640017. The next prime is 166640027. The reversal of 166640018 is 810046661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 162384049 + 4255969 = 12743^2 + 2063^2 .

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 (166640017) 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, 2450555 + ... + 2450622.

Almost surely, 2^166640018 is an apocalyptic number.

166640018 is a deficient number, since it is larger than the sum of its proper divisors (98023594).

166640018 is a wasteful number, since it uses less digits than its factorization.

166640018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4901196.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 166640018 is about 12908.9123476767. The cubic root of 166640018 is about 550.2918759328.

Adding to 166640018 its reverse (810046661), we get a palindrome (976686679).

The spelling of 166640018 in words is "one hundred sixty-six million, six hundred forty thousand, eighteen".