218311663317 has 64 divisors (see below), whose sum is σ = 339534858240. Its totient is φ = 123381792000.

The previous prime is 218311663309. The next prime is 218311663319. The reversal of 218311663317 is 713366113812.

It is not a de Polignac number, because 218311663317 - 2³ = 218311663309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218311663319) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10945608 + ... + 10965534.

It is an arithmetic number, because the mean of its divisors is an integer number (5305232160).

Almost surely, 2^218311663317 is an apocalyptic number.

It is an amenable number.

218311663317 is a deficient number, since it is larger than the sum of its proper divisors (121223194923).

218311663317 is a wasteful number, since it uses less digits than its factorization.

218311663317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20234.

The product of its digits is 108864, while the sum is 42.

The spelling of 218311663317 in words is "two hundred eighteen billion, three hundred eleven million, six hundred sixty-three thousand, three hundred seventeen".