66847345 has 8 divisors (see below), whose sum is σ = 82385064. Its totient is φ = 52032384.

The previous prime is 66847337. The next prime is 66847357. The reversal of 66847345 is 54374866.

66847345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4626801 + 62220544 = 2151^2 + 7888^2 .

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 66847345 - 2³ = 66847337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 180484 + ... + 180853.

It is an arithmetic number, because the mean of its divisors is an integer number (10298133).

Almost surely, 2^66847345 is an apocalyptic number.

It is an amenable number.

66847345 is a deficient number, since it is larger than the sum of its proper divisors (15537719).

66847345 is a wasteful number, since it uses less digits than its factorization.

66847345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361379.

The product of its digits is 483840, while the sum is 43.

The square root of 66847345 is about 8176.0225660158. The cubic root of 66847345 is about 405.8461099897.

The spelling of 66847345 in words is "sixty-six million, eight hundred forty-seven thousand, three hundred forty-five".