66665204 has 12 divisors (see below), whose sum is σ = 117339684. Its totient is φ = 33139584.

The previous prime is 66665197. The next prime is 66665213. The reversal of 66665204 is 40256666.

It can be written as a sum of positive squares in 2 ways, for example, as 45024100 + 21641104 = 6710^2 + 4652^2 .

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 47477 + ... + 48860.

It is an arithmetic number, because the mean of its divisors is an integer number (9778307).

Almost surely, 2^66665204 is an apocalyptic number.

It is an amenable number.

66665204 is a deficient number, since it is larger than the sum of its proper divisors (50674480).

66665204 is a wasteful number, since it uses less digits than its factorization.

66665204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96514 (or 96512 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 66665204 is about 8164.8762391110. The cubic root of 66665204 is about 405.4771676052.

The spelling of 66665204 in words is "sixty-six million, six hundred sixty-five thousand, two hundred four".