666546 has 8 divisors (see below), whose sum is σ = 1333104. Its totient is φ = 222180.

The previous prime is 666541. The next prime is 666557. The reversal of 666546 is 645666.

666546 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

666546 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (666541) by changing a digit.

666546 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 3 ways as a sum of consecutive naturals, for example, 55540 + ... + 55551.

It is an arithmetic number, because the mean of its divisors is an integer number (166638).

2⁶⁶⁶⁵⁴⁶ is an apocalyptic number.

666546 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666546 is a wasteful number, since it uses less digits than its factorization.

666546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111096.

The product of its digits is 25920, while the sum is 33.

The square root of 666546 is about 816.4226846432. The cubic root of 666546 is about 87.3527755535.

The spelling of 666546 in words is "six hundred sixty-six thousand, five hundred forty-six".