66945164 has 24 divisors (see below), whose sum is σ = 137636688. Its totient is φ = 28088640.

The previous prime is 66945163. The next prime is 66945181. The reversal of 66945164 is 46154966.

66945164 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66945163) 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 in 7 ways as a sum of consecutive naturals, for example, 57947 + ... + 59090.

It is an arithmetic number, because the mean of its divisors is an integer number (5734862).

Almost surely, 2^66945164 is an apocalyptic number.

It is an amenable number.

66945164 is an abundant number, since it is smaller than the sum of its proper divisors (70691524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66945164 is a wasteful number, since it uses less digits than its factorization.

66945164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117065 (or 117063 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 66945164 is about 8182.0024443898. The cubic root of 66945164 is about 406.0439743030.

The spelling of 66945164 in words is "sixty-six million, nine hundred forty-five thousand, one hundred sixty-four".