66544543 has 8 divisors (see below), whose sum is σ = 74779488. Its totient is φ = 58754784.

The previous prime is 66544529. The next prime is 66544549. The reversal of 66544543 is 34544566.

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 66544543 - 2⁹ = 66544031 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 (66544549) 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 7 ways as a sum of consecutive naturals, for example, 110980 + ... + 111577.

It is an arithmetic number, because the mean of its divisors is an integer number (9347436).

Almost surely, 2^66544543 is an apocalyptic number.

66544543 is a deficient number, since it is larger than the sum of its proper divisors (8234945).

66544543 is a wasteful number, since it uses less digits than its factorization.

66544543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222593.

The product of its digits is 172800, while the sum is 37.

The square root of 66544543 is about 8157.4838645259. The cubic root of 66544543 is about 405.2323880959.

The spelling of 66544543 in words is "sixty-six million, five hundred forty-four thousand, five hundred forty-three".