66549 has 8 divisors (see below), whose sum is σ = 101440. Its totient is φ = 38016.

The previous prime is 66541. The next prime is 66553. The reversal of 66549 is 94566.

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

It is not a de Polignac number, because 66549 - 2³ = 66541 is a prime.

It is a Duffinian number.

66549 is a lucky number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66541) 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, 1564 + ... + 1605.

It is an arithmetic number, because the mean of its divisors is an integer number (12680).

2⁶⁶⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

66549 is a deficient number, since it is larger than the sum of its proper divisors (34891).

66549 is a wasteful number, since it uses less digits than its factorization.

66549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3179.

The product of its digits is 6480, while the sum is 30.

The square root of 66549 is about 257.9709285947. The cubic root of 66549 is about 40.5241435071.

It can be divided in two parts, 6 and 6549, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 66549 in words is "sixty-six thousand, five hundred forty-nine".