66804004 has 6 divisors (see below), whose sum is σ = 116907014. Its totient is φ = 33402000.

The previous prime is 66803963. The next prime is 66804011. The reversal of 66804004 is 40040866.

It can be written as a sum of positive squares in only one way, i.e., 44222500 + 22581504 = 6650^2 + 4752^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8350497 + ... + 8350504.

Almost surely, 2^66804004 is an apocalyptic number.

It is an amenable number.

66804004 is a deficient number, since it is larger than the sum of its proper divisors (50103010).

66804004 is a wasteful number, since it uses less digits than its factorization.

66804004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16701005 (or 16701003 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 66804004 is about 8173.3716421071. The cubic root of 66804004 is about 405.7583798582.

The spelling of 66804004 in words is "sixty-six million, eight hundred four thousand, four".