66646064 has 10 divisors (see below), whose sum is σ = 129126780. Its totient is φ = 33323024.

The previous prime is 66646057. The next prime is 66646079. The reversal of 66646064 is 46064666.

66646064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 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, 2082674 + ... + 2082705.

It is an arithmetic number, because the mean of its divisors is an integer number (12912678).

Almost surely, 2^66646064 is an apocalyptic number.

It is an amenable number.

66646064 is a deficient number, since it is larger than the sum of its proper divisors (62480716).

66646064 is a wasteful number, since it uses less digits than its factorization.

66646064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4165387 (or 4165381 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 66646064 is about 8163.7040612702. The cubic root of 66646064 is about 405.4383588745.

The spelling of 66646064 in words is "sixty-six million, six hundred forty-six thousand, sixty-four".