218518106 has 8 divisors (see below), whose sum is σ = 328210164. Its totient is φ = 109114720.

The previous prime is 218518093. The next prime is 218518109. The reversal of 218518106 is 601815812.

It can be written as a sum of positive squares in 2 ways, for example, as 217297081 + 1221025 = 14741^2 + 1105^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (218518109) 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, 70265 + ... + 73308.

Almost surely, 2^218518106 is an apocalyptic number.

218518106 is a deficient number, since it is larger than the sum of its proper divisors (109692058).

218518106 is a wasteful number, since it uses less digits than its factorization.

218518106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144336.

The product of its (nonzero) digits is 3840, while the sum is 32.

The square root of 218518106 is about 14782.3579309933. The cubic root of 218518106 is about 602.3225774191.

The spelling of 218518106 in words is "two hundred eighteen million, five hundred eighteen thousand, one hundred six".