66814218 has 24 divisors (see below), whose sum is σ = 151059168. Its totient is φ = 21302952.

The previous prime is 66814201. The next prime is 66814229. The reversal of 66814218 is 81241866.

66814218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

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, 80280 + ... + 81107.

It is an arithmetic number, because the mean of its divisors is an integer number (6294132).

Almost surely, 2^66814218 is an apocalyptic number.

66814218 is an abundant number, since it is smaller than the sum of its proper divisors (84244950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66814218 is a wasteful number, since it uses less digits than its factorization.

66814218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161418 (or 161415 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 66814218 is about 8173.9964521646. The cubic root of 66814218 is about 405.7790582838.

The spelling of 66814218 in words is "sixty-six million, eight hundred fourteen thousand, two hundred eighteen".