66600004 has 6 divisors (see below), whose sum is σ = 116550014. Its totient is φ = 33300000.

The previous prime is 66599989. The next prime is 66600029. The reversal of 66600004 is 40000666.

66600004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 39037504 + 27562500 = 6248^2 + 5250^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8324997 + ... + 8325004.

Almost surely, 2^66600004 is an apocalyptic number.

It is an amenable number.

66600004 is a deficient number, since it is larger than the sum of its proper divisors (49950010).

66600004 is a wasteful number, since it uses less digits than its factorization.

66600004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16650005 (or 16650003 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 66600004 is about 8160.8825503128. The cubic root of 66600004 is about 405.3449360305.

The spelling of 66600004 in words is "sixty-six million, six hundred thousand, four".