66544853 has 4 divisors (see below), whose sum is σ = 66646188. Its totient is φ = 66443520.

The previous prime is 66544847. The next prime is 66544867. The reversal of 66544853 is 35844566.

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 56445169 + 10099684 = 7513^2 + 3178^2 .

It is a cyclic number.

It is not a de Polignac number, because 66544853 - 2⁶ = 66544789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66544853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66544843) 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 3 ways as a sum of consecutive naturals, for example, 49676 + ... + 50997.

It is an arithmetic number, because the mean of its divisors is an integer number (16661547).

Almost surely, 2^66544853 is an apocalyptic number.

It is an amenable number.

66544853 is a deficient number, since it is larger than the sum of its proper divisors (101335).

66544853 is a wasteful number, since it uses less digits than its factorization.

66544853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101334.

The product of its digits is 345600, while the sum is 41.

The square root of 66544853 is about 8157.5028654607. The cubic root of 66544853 is about 405.2330173579.

The spelling of 66544853 in words is "sixty-six million, five hundred forty-four thousand, eight hundred fifty-three".