66807018 has 28 divisors (see below), whose sum is σ = 150250338. Its totient is φ = 22268520.

The previous prime is 66807011. The next prime is 66807023. The reversal of 66807018 is 81070866.

It can be written as a sum of positive squares in only one way, i.e., 34963569 + 31843449 = 5913^2 + 5643^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66807011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 21453 + ... + 24368.

Almost surely, 2^66807018 is an apocalyptic number.

66807018 is an abundant number, since it is smaller than the sum of its proper divisors (83443320).

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

66807018 is an equidigital number, since it uses as much as digits as its factorization.

66807018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45841 (or 45826 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 66807018 is about 8173.5560192611. The cubic root of 66807018 is about 405.7644819743.

The spelling of 66807018 in words is "sixty-six million, eight hundred seven thousand, eighteen".