218066985 has 24 divisors (see below), whose sum is σ = 391984320. Its totient is φ = 116301744.

The previous prime is 218066951. The next prime is 218067029. The reversal of 218066985 is 589660812.

It is not a de Polignac number, because 218066985 - 2⁸ = 218066729 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 218066985.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 88525 + ... + 90954.

It is an arithmetic number, because the mean of its divisors is an integer number (16332680).

Almost surely, 2^218066985 is an apocalyptic number.

It is an amenable number.

218066985 is a deficient number, since it is larger than the sum of its proper divisors (173917335).

218066985 is an equidigital number, since it uses as much as digits as its factorization.

218066985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179499 (or 179487 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 218066985 is about 14767.0912843390. The cubic root of 218066985 is about 601.9078023873.

The spelling of 218066985 in words is "two hundred eighteen million, sixty-six thousand, nine hundred eighty-five".