218038985523 has 6 divisors (see below), whose sum is σ = 314945201324. Its totient is φ = 145359323676.

The previous prime is 218038985513. The next prime is 218038985551. The reversal of 218038985523 is 325589830812.

218038985523 is a `hidden beast` number, since 2 + 1 + 8 + 0 + 3 + 89 + 8 + 552 + 3 = 666.

It is not a de Polignac number, because 218038985523 - 2¹² = 218038981427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218038985523.

It is not an unprimeable number, because it can be changed into a prime (218038985513) 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 5 ways as a sum of consecutive naturals, for example, 12113276965 + ... + 12113276982.

Almost surely, 2^218038985523 is an apocalyptic number.

218038985523 is a deficient number, since it is larger than the sum of its proper divisors (96906215801).

218038985523 is a wasteful number, since it uses less digits than its factorization.

218038985523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24226553953 (or 24226553950 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 54.

The spelling of 218038985523 in words is "two hundred eighteen billion, thirty-eight million, nine hundred eighty-five thousand, five hundred twenty-three".