666548 has 12 divisors (see below), whose sum is σ = 1183392. Its totient is φ = 328440.

The previous prime is 666541. The next prime is 666557. The reversal of 666548 is 845666.

666548 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666541) 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, 890 + ... + 1457.

It is an arithmetic number, because the mean of its divisors is an integer number (98616).

2⁶⁶⁶⁵⁴⁸ is an apocalyptic number.

It is an amenable number.

666548 is a deficient number, since it is larger than the sum of its proper divisors (516844).

666548 is a wasteful number, since it uses less digits than its factorization.

666548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2422 (or 2420 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 666548 is about 816.4239094980. The cubic root of 666548 is about 87.3528629220.

The spelling of 666548 in words is "six hundred sixty-six thousand, five hundred forty-eight".