66518 has 8 divisors (see below), whose sum is σ = 101280. Its totient is φ = 32760.

The previous prime is 66509. The next prime is 66523. The reversal of 66518 is 81566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53 + ... + 368.

It is an arithmetic number, because the mean of its divisors is an integer number (12660).

2⁶⁶⁵¹⁸ is an apocalyptic number.

66518 is a deficient number, since it is larger than the sum of its proper divisors (34762).

66518 is a wasteful number, since it uses less digits than its factorization.

66518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502.

The product of its digits is 1440, while the sum is 26.

The square root of 66518 is about 257.9108373062. The cubic root of 66518 is about 40.5178501816.

The spelling of 66518 in words is "sixty-six thousand, five hundred eighteen".