218001531734018 has 16 divisors (see below), whose sum is σ = 336187270158264. Its totient is φ = 105958303693440.

The previous prime is 218001531733981. The next prime is 218001531734023. The reversal of 218001531734018 is 810437135100812.

It can be written as a sum of positive squares in 4 ways, for example, as 171976392756529 + 46025138977489 = 13113977^2 + 6784183^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 218001531734018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4798813505 + ... + 4798858932.

Almost surely, 2^{218001531734018} is an apocalyptic number.

218001531734018 is a deficient number, since it is larger than the sum of its proper divisors (118185738424246).

218001531734018 is a wasteful number, since it uses less digits than its factorization.

218001531734018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9597672757.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 218001531734018 in words is "two hundred eighteen trillion, one billion, five hundred thirty-one million, seven hundred thirty-four thousand, eighteen".