66544533 has 12 divisors (see below), whose sum is σ = 104858208. Its totient is φ = 40329960.

The previous prime is 66544529. The next prime is 66544549. The reversal of 66544533 is 33544566.

66544533 is a `hidden beast` number, since 66 + 544 + 53 + 3 = 666.

It is not a de Polignac number, because 66544533 - 2² = 66544529 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 (66544553) 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 11 ways as a sum of consecutive naturals, for example, 335985 + ... + 336182.

It is an arithmetic number, because the mean of its divisors is an integer number (8738184).

Almost surely, 2^66544533 is an apocalyptic number.

It is an amenable number.

66544533 is a deficient number, since it is larger than the sum of its proper divisors (38313675).

66544533 is a wasteful number, since it uses less digits than its factorization.

66544533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672184 (or 672181 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

The square root of 66544533 is about 8157.4832515918. The cubic root of 66544533 is about 405.2323677971.

The spelling of 66544533 in words is "sixty-six million, five hundred forty-four thousand, five hundred thirty-three".