218217965 has 16 divisors (see below), whose sum is σ = 299756160. Its totient is φ = 149392320.

The previous prime is 218217941. The next prime is 218217973. The reversal of 218217965 is 569712812.

It is not a de Polignac number, because 218217965 - 2⁸ = 218217709 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18335 + ... + 27795.

It is an arithmetic number, because the mean of its divisors is an integer number (18734760).

Almost surely, 2^218217965 is an apocalyptic number.

It is an amenable number.

218217965 is a deficient number, since it is larger than the sum of its proper divisors (81538195).

218217965 is an equidigital number, since it uses as much as digits as its factorization.

218217965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10132.

The product of its digits is 60480, while the sum is 41.

The square root of 218217965 is about 14772.2024424254. The cubic root of 218217965 is about 602.0466818470.

The spelling of 218217965 in words is "two hundred eighteen million, two hundred seventeen thousand, nine hundred sixty-five".