66547 has 4 divisors (see below), whose sum is σ = 71680. Its totient is φ = 61416.

The previous prime is 66541. The next prime is 66553. The reversal of 66547 is 74566.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66541) and next prime (66553).

It is a cyclic number.

It is not a de Polignac number, because 66547 - 2¹¹ = 64499 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 2547 + ... + 2572.

It is an arithmetic number, because the mean of its divisors is an integer number (17920).

2⁶⁶⁵⁴⁷ is an apocalyptic number.

66547 is a deficient number, since it is larger than the sum of its proper divisors (5133).

66547 is a wasteful number, since it uses less digits than its factorization.

66547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132.

The product of its digits is 5040, while the sum is 28.

The square root of 66547 is about 257.9670521598. The cubic root of 66547 is about 40.5237375451.

The spelling of 66547 in words is "sixty-six thousand, five hundred forty-seven".