218018885 has 12 divisors (see below), whose sum is σ = 304336908. Its totient is φ = 149498496.

The previous prime is 218018861. The next prime is 218018887. The reversal of 218018885 is 588810812.

It can be written as a sum of positive squares in 2 ways, for example, as 110544196 + 107474689 = 10514^2 + 10367^2 .

It is not a de Polignac number, because 218018885 - 2¹⁰ = 218017861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218018887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 444692 + ... + 445181.

It is an arithmetic number, because the mean of its divisors is an integer number (25361409).

Almost surely, 2^218018885 is an apocalyptic number.

It is an amenable number.

218018885 is a deficient number, since it is larger than the sum of its proper divisors (86318023).

218018885 is an equidigital number, since it uses as much as digits as its factorization.

218018885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889892 (or 889885 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 41.

The square root of 218018885 is about 14765.4625731807. The cubic root of 218018885 is about 601.8635439770.

The spelling of 218018885 in words is "two hundred eighteen million, eighteen thousand, eight hundred eighty-five".