66144313 has 4 divisors (see below), whose sum is σ = 67228708. Its totient is φ = 65059920.

The previous prime is 66144311. The next prime is 66144317. The reversal of 66144313 is 31344166.

66144313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 33790969 + 32353344 = 5813^2 + 5688^2 .

It is a cyclic number.

It is not a de Polignac number, because 66144313 - 2¹ = 66144311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66144311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542106 + ... + 542227.

It is an arithmetic number, because the mean of its divisors is an integer number (16807177).

Almost surely, 2^66144313 is an apocalyptic number.

It is an amenable number.

66144313 is a deficient number, since it is larger than the sum of its proper divisors (1084395).

66144313 is a wasteful number, since it uses less digits than its factorization.

66144313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084394.

The product of its digits is 5184, while the sum is 28.

The square root of 66144313 is about 8132.9154059292. The cubic root of 66144313 is about 404.4183348485.

Adding to 66144313 its reverse (31344166), we get a palindrome (97488479).

The spelling of 66144313 in words is "sixty-six million, one hundred forty-four thousand, three hundred thirteen".