66534218 has 4 divisors (see below), whose sum is σ = 99801330. Its totient is φ = 33267108.

The previous prime is 66534203. The next prime is 66534227. The reversal of 66534218 is 81243566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 51222649 + 15311569 = 7157^2 + 3913^2 .

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 as a sum of consecutive naturals, namely, 16633553 + ... + 16633556.

Almost surely, 2^66534218 is an apocalyptic number.

66534218 is a deficient number, since it is larger than the sum of its proper divisors (33267112).

66534218 is a wasteful number, since it uses less digits than its factorization.

66534218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33267111.

The product of its digits is 34560, while the sum is 35.

The square root of 66534218 is about 8156.8509855213. The cubic root of 66534218 is about 405.2114284969.

The spelling of 66534218 in words is "sixty-six million, five hundred thirty-four thousand, two hundred eighteen".