66564045 has 16 divisors (see below), whose sum is σ = 118336320. Its totient is φ = 35500752.

The previous prime is 66564041. The next prime is 66564067. The reversal of 66564045 is 54046566.

It is a happy number.

66564045 is a `hidden beast` number, since 6 + 6 + 5 + 640 + 4 + 5 = 666.

It is not a de Polignac number, because 66564045 - 2² = 66564041 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66564041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246399 + ... + 246668.

It is an arithmetic number, because the mean of its divisors is an integer number (7396020).

Almost surely, 2^66564045 is an apocalyptic number.

It is an amenable number.

66564045 is a deficient number, since it is larger than the sum of its proper divisors (51772275).

66564045 is a wasteful number, since it uses less digits than its factorization.

66564045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493081 (or 493075 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 66564045 is about 8158.6791210342. The cubic root of 66564045 is about 405.2719709567.

It can be divided in two parts, 6656 and 4045, that added together give a palindrome (10701).

The spelling of 66564045 in words is "sixty-six million, five hundred sixty-four thousand, forty-five".