665546 has 16 divisors (see below), whose sum is σ = 1152576. Its totient is φ = 282336.

The previous prime is 665527. The next prime is 665549. The reversal of 665546 is 645566.

665546 is nontrivially palindromic in base 6.

665546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665549) by changing a digit.

665546 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1745 + ... + 2091.

It is an arithmetic number, because the mean of its divisors is an integer number (72036).

2⁶⁶⁵⁵⁴⁶ is an apocalyptic number.

665546 is a deficient number, since it is larger than the sum of its proper divisors (487030).

665546 is a wasteful number, since it uses less digits than its factorization.

665546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493.

The product of its digits is 21600, while the sum is 32.

The square root of 665546 is about 815.8100269058. The cubic root of 665546 is about 87.3090693945.

The spelling of 665546 in words is "six hundred sixty-five thousand, five hundred forty-six".