218107018 has 4 divisors (see below), whose sum is σ = 327160530. Its totient is φ = 109053508.

The previous prime is 218107013. The next prime is 218107039. The reversal of 218107018 is 810701812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 152448409 + 65658609 = 12347^2 + 8103^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (218107013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54526753 + ... + 54526756.

Almost surely, 2^218107018 is an apocalyptic number.

218107018 is a deficient number, since it is larger than the sum of its proper divisors (109053512).

218107018 is a wasteful number, since it uses less digits than its factorization.

218107018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109053511.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 218107018 is about 14768.4467023448. The cubic root of 218107018 is about 601.9446331202.

It can be divided in two parts, 21 and 8107018, that multiplied together give a triangular number (170247378 = T₁₈₄₅₂).

The spelling of 218107018 in words is "two hundred eighteen million, one hundred seven thousand, eighteen".