66847 has 8 divisors (see below), whose sum is σ = 74880. Its totient is φ = 59160.

The previous prime is 66841. The next prime is 66851. The reversal of 66847 is 74866.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598 + ... + 700.

It is an arithmetic number, because the mean of its divisors is an integer number (9360).

2⁶⁶⁸⁴⁷ is an apocalyptic number.

66847 is a deficient number, since it is larger than the sum of its proper divisors (8033).

66847 is a wasteful number, since it uses less digits than its factorization.

66847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173.

The product of its digits is 8064, while the sum is 31.

The square root of 66847 is about 258.5478679084. The cubic root of 66847 is about 40.5845411796.

The spelling of 66847 in words is "sixty-six thousand, eight hundred forty-seven".