18218216068 has 12 divisors (see below), whose sum is σ = 34334330380. Its totient is φ = 8408407392.

The previous prime is 18218216017. The next prime is 18218216069. The reversal of 18218216068 is 86061281281.

It can be written as a sum of positive squares in 2 ways, for example, as 2826836224 + 15391379844 = 53168^2 + 124062^2 .

It is not an unprimeable number, because it can be changed into a prime (18218216069) 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, 175175103 + ... + 175175206.

Almost surely, 2^18218216068 is an apocalyptic number.

It is an amenable number.

18218216068 is a deficient number, since it is larger than the sum of its proper divisors (16116114312).

18218216068 is a wasteful number, since it uses less digits than its factorization.

18218216068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350350326 (or 350350324 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 43.

The spelling of 18218216068 in words is "eighteen billion, two hundred eighteen million, two hundred sixteen thousand, sixty-eight".