218164165 has 8 divisors (see below), whose sum is σ = 266736888. Its totient is φ = 171238080.

The previous prime is 218164153. The next prime is 218164181. The reversal of 218164165 is 561461812.

It can be written as a sum of positive squares in 4 ways, for example, as 81414529 + 136749636 = 9023^2 + 11694^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218164165 - 2²⁷ = 83946437 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 218164165.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 411366 + ... + 411895.

It is an arithmetic number, because the mean of its divisors is an integer number (33342111).

Almost surely, 2^218164165 is an apocalyptic number.

It is an amenable number.

218164165 is a deficient number, since it is larger than the sum of its proper divisors (48572723).

218164165 is an equidigital number, since it uses as much as digits as its factorization.

218164165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823319.

The product of its digits is 11520, while the sum is 34.

The square root of 218164165 is about 14770.3813424028. The cubic root of 218164165 is about 601.9972010848.

The spelling of 218164165 in words is "two hundred eighteen million, one hundred sixty-four thousand, one hundred sixty-five".