66849 has 4 divisors (see below), whose sum is σ = 89136. Its totient is φ = 44564.

The previous prime is 66841. The next prime is 66851. The reversal of 66849 is 94866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66849 - 2³ = 66841 is a prime.

It is a d-powerful number, because it can be written as 6² + 6² + 8³ + 4⁸ + 9³ .

It is a D-number.

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

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11139 + ... + 11144.

It is an arithmetic number, because the mean of its divisors is an integer number (22284).

2⁶⁶⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

66849 is a deficient number, since it is larger than the sum of its proper divisors (22287).

66849 is a wasteful number, since it uses less digits than its factorization.

66849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22286.

The product of its digits is 10368, while the sum is 33.

The square root of 66849 is about 258.5517356352. The cubic root of 66849 is about 40.5849459261.

It can be divided in two parts, 668 and 49, that added together give a palindrome (717).

The spelling of 66849 in words is "sixty-six thousand, eight hundred forty-nine".