66189313 has 4 divisors (see below), whose sum is σ = 70082820. Its totient is φ = 62295808.

The previous prime is 66189307. The next prime is 66189317. The reversal of 66189313 is 31398166.

66189313 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 34963569 + 31225744 = 5913^2 + 5588^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66189313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66189317) 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, 1946728 + ... + 1946761.

It is an arithmetic number, because the mean of its divisors is an integer number (17520705).

Almost surely, 2^66189313 is an apocalyptic number.

It is an amenable number.

66189313 is a deficient number, since it is larger than the sum of its proper divisors (3893507).

66189313 is a wasteful number, since it uses less digits than its factorization.

66189313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3893506.

The product of its digits is 23328, while the sum is 37.

The square root of 66189313 is about 8135.6814711492. The cubic root of 66189313 is about 404.5100267805.

It can be divided in two parts, 6618 and 9313, that added together give a triangular number (15931 = T₁₇₈).

The spelling of 66189313 in words is "sixty-six million, one hundred eighty-nine thousand, three hundred thirteen".