218109065 has 8 divisors (see below), whose sum is σ = 277126920. Its totient is φ = 164223232.

The previous prime is 218108993. The next prime is 218109103. The reversal of 218109065 is 560901812.

It can be written as a sum of positive squares in 4 ways, for example, as 63952009 + 154157056 = 7997^2 + 12416^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 218109065 - 2¹⁴ = 218092681 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1282910 + ... + 1283079.

It is an arithmetic number, because the mean of its divisors is an integer number (34640865).

Almost surely, 2^218109065 is an apocalyptic number.

It is an amenable number.

218109065 is a deficient number, since it is larger than the sum of its proper divisors (59017855).

218109065 is a wasteful number, since it uses less digits than its factorization.

218109065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566011.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 218109065 is about 14768.5160053406. The cubic root of 218109065 is about 601.9465162582.

The spelling of 218109065 in words is "two hundred eighteen million, one hundred nine thousand, sixty-five".