66544045 has 8 divisors (see below), whose sum is σ = 80033400. Its totient is φ = 53114880.

The previous prime is 66544031. The next prime is 66544139. The reversal of 66544045 is 54044566.

It can be written as a sum of positive squares in 4 ways, for example, as 24631369 + 41912676 = 4963^2 + 6474^2 .

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

It is not a de Polignac number, because 66544045 - 2⁵ = 66544013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66544045.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 12576 + ... + 17065.

It is an arithmetic number, because the mean of its divisors is an integer number (10004175).

Almost surely, 2^66544045 is an apocalyptic number.

It is an amenable number.

66544045 is a deficient number, since it is larger than the sum of its proper divisors (13489355).

66544045 is a wasteful number, since it uses less digits than its factorization.

66544045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30095.

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 66544045 is about 8157.4533403508. The cubic root of 66544045 is about 405.2313772130.

The spelling of 66544045 in words is "sixty-six million, five hundred forty-four thousand, forty-five".