663549 has 12 divisors (see below), whose sum is σ = 919776. Its totient is φ = 425488.

The previous prime is 663547. The next prime is 663557. The reversal of 663549 is 945366.

It is a happy number.

It is not a de Polignac number, because 663549 - 2¹ = 663547 is a prime.

Its product of digits (19440) is a multiple of the sum of its prime factors (324).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2392 + ... + 2654.

It is an arithmetic number, because the mean of its divisors is an integer number (76648).

2⁶⁶³⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

663549 is a deficient number, since it is larger than the sum of its proper divisors (256227).

663549 is a wasteful number, since it uses less digits than its factorization.

663549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 295 counting only the distinct ones).

The product of its digits is 19440, while the sum is 33.

The square root of 663549 is about 814.5851705009. The cubic root of 663549 is about 87.2216570089.

The spelling of 663549 in words is "six hundred sixty-three thousand, five hundred forty-nine".