218409268717 has 16 divisors (see below), whose sum is σ = 225205731520. Its totient is φ = 211692362112.

The previous prime is 218409268691. The next prime is 218409268741. The reversal of 218409268717 is 717862904812.

It is a cyclic number.

It is not a de Polignac number, because 218409268717 - 2¹⁵ = 218409235949 is a prime.

It is a super-2 number, since 2×218409268717² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218409260717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14199643 + ... + 14215015.

It is an arithmetic number, because the mean of its divisors is an integer number (14075358220).

Almost surely, 2^218409268717 is an apocalyptic number.

It is an amenable number.

218409268717 is a deficient number, since it is larger than the sum of its proper divisors (6796462803).

218409268717 is a wasteful number, since it uses less digits than its factorization.

218409268717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17932.

The product of its (nonzero) digits is 2709504, while the sum is 55.

The spelling of 218409268717 in words is "two hundred eighteen billion, four hundred nine million, two hundred sixty-eight thousand, seven hundred seventeen".