66566189 has 8 divisors (see below), whose sum is σ = 68042520. Its totient is φ = 65102400.

The previous prime is 66566141. The next prime is 66566221. The reversal of 66566189 is 98166566.

It can be written as a sum of positive squares in 4 ways, for example, as 13225 + 66552964 = 115^2 + 8158^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66566189 - 2¹⁶ = 66500653 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 (66566789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8027 + ... + 14055.

It is an arithmetic number, because the mean of its divisors is an integer number (8505315).

Almost surely, 2^66566189 is an apocalyptic number.

It is an amenable number.

66566189 is a deficient number, since it is larger than the sum of its proper divisors (1476331).

66566189 is a wasteful number, since it uses less digits than its factorization.

66566189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6271.

The product of its digits is 466560, while the sum is 47.

The square root of 66566189 is about 8158.8105137943. The cubic root of 66566189 is about 405.2763221234.

The spelling of 66566189 in words is "sixty-six million, five hundred sixty-six thousand, one hundred eighty-nine".