218972665218 has 16 divisors (see below), whose sum is σ = 442197228096. Its totient is φ = 72282238800.

The previous prime is 218972665199. The next prime is 218972665237. The reversal of 218972665218 is 812566279812.

It is an interprime number because it is at equal distance from previous prime (218972665199) and next prime (218972665237).

It is a super-2 number, since 2×218972665218² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

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, 177161733 + ... + 177162968.

It is an arithmetic number, because the mean of its divisors is an integer number (27637326756).

Almost surely, 2^218972665218 is an apocalyptic number.

218972665218 is an abundant number, since it is smaller than the sum of its proper divisors (223224562878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218972665218 is a wasteful number, since it uses less digits than its factorization.

218972665218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354324809.

The product of its digits is 5806080, while the sum is 57.

The spelling of 218972665218 in words is "two hundred eighteen billion, nine hundred seventy-two million, six hundred sixty-five thousand, two hundred eighteen".