66658964 has 6 divisors (see below), whose sum is σ = 116653194. Its totient is φ = 33329480.

The previous prime is 66658961. The next prime is 66658993. The reversal of 66658964 is 46985666.

66658964 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., 42354064 + 24304900 = 6508^2 + 4930^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66658961) 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, 8332367 + ... + 8332374.

It is an arithmetic number, because the mean of its divisors is an integer number (19442199).

Almost surely, 2^66658964 is an apocalyptic number.

It is an amenable number.

66658964 is a deficient number, since it is larger than the sum of its proper divisors (49994230).

66658964 is a wasteful number, since it uses less digits than its factorization.

66658964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16664745 (or 16664743 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 50.

The square root of 66658964 is about 8164.4941055769. The cubic root of 66658964 is about 405.4645160452.

The spelling of 66658964 in words is "sixty-six million, six hundred fifty-eight thousand, nine hundred sixty-four".