218038985522 has 18 divisors (see below), whose sum is σ = 337980815487. Its totient is φ = 105492829500.

The previous prime is 218038985513. The next prime is 218038985551. The reversal of 218038985522 is 225589830812.

It can be written as a sum of positive squares in only one way, i.e., 109019492761 + 109019492761 = 330181^2 + 330181^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=330181.

It is a super-2 number, since 2×218038985522² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 20465897 + ... + 20476547.

Almost surely, 2^218038985522 is an apocalyptic number.

218038985522 is a deficient number, since it is larger than the sum of its proper divisors (119941829965).

218038985522 is an frugal number, since it uses more digits than its factorization.

218038985522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21366 (or 10684 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 53.

The spelling of 218038985522 in words is "two hundred eighteen billion, thirty-eight million, nine hundred eighty-five thousand, five hundred twenty-two".