218229965 has 4 divisors (see below), whose sum is σ = 261875964. Its totient is φ = 174583968.

The previous prime is 218229961. The next prime is 218229983. The reversal of 218229965 is 569922812.

218229965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81667369 + 136562596 = 9037^2 + 11686^2 .

It is a cyclic number.

It is not a de Polignac number, because 218229965 - 2² = 218229961 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 (218229961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21822992 + ... + 21823001.

It is an arithmetic number, because the mean of its divisors is an integer number (65468991).

Almost surely, 2^218229965 is an apocalyptic number.

It is an amenable number.

218229965 is a deficient number, since it is larger than the sum of its proper divisors (43645999).

218229965 is an equidigital number, since it uses as much as digits as its factorization.

218229965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43645998.

The product of its digits is 155520, while the sum is 44.

The square root of 218229965 is about 14772.6086051178. The cubic root of 218229965 is about 602.0577173389.

The spelling of 218229965 in words is "two hundred eighteen million, two hundred twenty-nine thousand, nine hundred sixty-five".