66873818 has 16 divisors (see below), whose sum is σ = 115867584. Its totient is φ = 28608960.

The previous prime is 66873803. The next prime is 66873853. The reversal of 66873818 is 81837866.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 89030 + ... + 89777.

It is an arithmetic number, because the mean of its divisors is an integer number (7241724).

Almost surely, 2^66873818 is an apocalyptic number.

66873818 is a deficient number, since it is larger than the sum of its proper divisors (48993766).

66873818 is a wasteful number, since it uses less digits than its factorization.

66873818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178837.

The product of its digits is 387072, while the sum is 47.

The square root of 66873818 is about 8177.6413469900. The cubic root of 66873818 is about 405.8996775428.

The spelling of 66873818 in words is "sixty-six million, eight hundred seventy-three thousand, eight hundred eighteen".