218440522881 has 24 divisors (see below), whose sum is σ = 360712239680. Its totient is φ = 124784382816.

The previous prime is 218440522831. The next prime is 218440522901. The reversal of 218440522881 is 188225044812.

It is a happy number.

218440522881 is a `hidden beast` number, since 2 + 1 + 8 + 4 + 40 + 522 + 8 + 81 = 666.

It is not a de Polignac number, because 218440522881 - 2¹⁹ = 218439998593 is a prime.

It is a super-2 number, since 2×218440522881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218440522801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 333475 + ... + 740328.

Almost surely, 2^218440522881 is an apocalyptic number.

218440522881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

218440522881 is a deficient number, since it is larger than the sum of its proper divisors (142271716799).

218440522881 is a wasteful number, since it uses less digits than its factorization.

218440522881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077045 (or 1077042 counting only the distinct ones).

The product of its (nonzero) digits is 327680, while the sum is 45.

It can be divided in two parts, 218440 and 522881, that added together give a square (741321 = 861²).

The spelling of 218440522881 in words is "two hundred eighteen billion, four hundred forty million, five hundred twenty-two thousand, eight hundred eighty-one".