66564829 has 4 divisors (see below), whose sum is σ = 69458976. Its totient is φ = 63670684.

The previous prime is 66564811. The next prime is 66564833. The reversal of 66564829 is 92846566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66564829 - 2⁹ = 66564317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66564529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1447039 + ... + 1447084.

It is an arithmetic number, because the mean of its divisors is an integer number (17364744).

Almost surely, 2^66564829 is an apocalyptic number.

It is an amenable number.

66564829 is a deficient number, since it is larger than the sum of its proper divisors (2894147).

66564829 is a wasteful number, since it uses less digits than its factorization.

66564829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2894146.

The product of its digits is 622080, while the sum is 46.

The square root of 66564829 is about 8158.7271678859. The cubic root of 66564829 is about 405.2735620658.

The spelling of 66564829 in words is "sixty-six million, five hundred sixty-four thousand, eight hundred twenty-nine".