218942065 has 12 divisors (see below), whose sum is σ = 279096156. Its totient is φ = 164849408.

The previous prime is 218942063. The next prime is 218942071. The reversal of 218942065 is 560249812.

It can be written as a sum of positive squares in 6 ways, for example, as 65999376 + 152942689 = 8124^2 + 12367^2 .

It is not a de Polignac number, because 218942065 - 2¹ = 218942063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218942063) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 74314 + ... + 77203.

It is an arithmetic number, because the mean of its divisors is an integer number (23258013).

Almost surely, 2^218942065 is an apocalyptic number.

It is an amenable number.

218942065 is a deficient number, since it is larger than the sum of its proper divisors (60154091).

218942065 is a wasteful number, since it uses less digits than its factorization.

218942065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151556 (or 151539 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 218942065 is about 14796.6910152236. The cubic root of 218942065 is about 602.7118588292.

The spelling of 218942065 in words is "two hundred eighteen million, nine hundred forty-two thousand, sixty-five".