66918 has 16 divisors (see below), whose sum is σ = 141120. Its totient is φ = 21096.

The previous prime is 66889. The next prime is 66919. The reversal of 66918 is 81966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180 + ... + 407.

It is an arithmetic number, because the mean of its divisors is an integer number (8820).

2⁶⁶⁹¹⁸ is an apocalyptic number.

66918 is an abundant number, since it is smaller than the sum of its proper divisors (74202).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70560).

66918 is a wasteful number, since it uses less digits than its factorization.

66918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611.

The product of its digits is 2592, while the sum is 30.

The square root of 66918 is about 258.6851367976. The cubic root of 66918 is about 40.5989047404.

The spelling of 66918 in words is "sixty-six thousand, nine hundred eighteen".