66564043 has 16 divisors (see below), whose sum is σ = 83835136. Its totient is φ = 51438240.

The previous prime is 66564041. The next prime is 66564067. The reversal of 66564043 is 34046566.

It is not a de Polignac number, because 66564043 - 2¹ = 66564041 is a prime.

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, 4593 + ... + 12418.

It is an arithmetic number, because the mean of its divisors is an integer number (5239696).

Almost surely, 2^66564043 is an apocalyptic number.

66564043 is a deficient number, since it is larger than the sum of its proper divisors (17271093).

66564043 is a wasteful number, since it uses less digits than its factorization.

66564043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17074.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 66564043 is about 8158.6789984654. The cubic root of 66564043 is about 405.2719668977.

The spelling of 66564043 in words is "sixty-six million, five hundred sixty-four thousand, forty-three".