66556064 has 12 divisors (see below), whose sum is σ = 131032314. Its totient is φ = 33278016.

The previous prime is 66556057. The next prime is 66556067. The reversal of 66556064 is 46065566.

66556064 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., 47720464 + 18835600 = 6908^2 + 4340^2 .

It is not an unprimeable number, because it can be changed into a prime (66556067) by changing a digit.

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, 1039907 + ... + 1039970.

Almost surely, 2^66556064 is an apocalyptic number.

It is an amenable number.

66556064 is a deficient number, since it is larger than the sum of its proper divisors (64476250).

66556064 is a wasteful number, since it uses less digits than its factorization.

66556064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079887 (or 2079879 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 66556064 is about 8158.1899953360. The cubic root of 66556064 is about 405.2557729984.

The spelling of 66556064 in words is "sixty-six million, five hundred fifty-six thousand, sixty-four".