663543 has 6 divisors (see below), whose sum is σ = 958464. Its totient is φ = 442356.

The previous prime is 663541. The next prime is 663547. The reversal of 663543 is 345366.

It is not a de Polignac number, because 663543 - 2¹ = 663541 is a prime.

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 5 ways as a sum of consecutive naturals, for example, 36855 + ... + 36872.

It is an arithmetic number, because the mean of its divisors is an integer number (159744).

2⁶⁶³⁵⁴³ is an apocalyptic number.

663543 is a deficient number, since it is larger than the sum of its proper divisors (294921).

663543 is a wasteful number, since it uses less digits than its factorization.

663543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73733 (or 73730 counting only the distinct ones).

The product of its digits is 6480, while the sum is 27.

The square root of 663543 is about 814.5814876364. The cubic root of 663543 is about 87.2213941138.

The spelling of 663543 in words is "six hundred sixty-three thousand, five hundred forty-three".