66814518 has 16 divisors (see below), whose sum is σ = 136737216. Its totient is φ = 21753480.

The previous prime is 66814457. The next prime is 66814519. The reversal of 66814518 is 81541866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66814519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129228 + ... + 129743.

It is an arithmetic number, because the mean of its divisors is an integer number (8546076).

Almost surely, 2^66814518 is an apocalyptic number.

66814518 is an abundant number, since it is smaller than the sum of its proper divisors (69922698).

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

66814518 is a wasteful number, since it uses less digits than its factorization.

66814518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259019.

The product of its digits is 46080, while the sum is 39.

The square root of 66814518 is about 8174.0148030206. The cubic root of 66814518 is about 405.7796656073.

The spelling of 66814518 in words is "sixty-six million, eight hundred fourteen thousand, five hundred eighteen".