66544585 has 4 divisors (see below), whose sum is σ = 79853508. Its totient is φ = 53235664.

The previous prime is 66544561. The next prime is 66544603. The reversal of 66544585 is 58544566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26904969 + 39639616 = 5187^2 + 6296^2 .

It is a cyclic number.

It is not a de Polignac number, because 66544585 - 2⁵ = 66544553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6654454 + ... + 6654463.

It is an arithmetic number, because the mean of its divisors is an integer number (19963377).

Almost surely, 2^66544585 is an apocalyptic number.

It is an amenable number.

66544585 is a deficient number, since it is larger than the sum of its proper divisors (13308923).

66544585 is a wasteful number, since it uses less digits than its factorization.

66544585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13308922.

The product of its digits is 576000, while the sum is 43.

The square root of 66544585 is about 8157.4864388487. The cubic root of 66544585 is about 405.2324733509.

The spelling of 66544585 in words is "sixty-six million, five hundred forty-four thousand, five hundred eighty-five".