669543 has 8 divisors (see below), whose sum is σ = 1020288. Its totient is φ = 382584.

The previous prime is 669527. The next prime is 669551. The reversal of 669543 is 345966.

It is a happy number.

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

It is not a de Polignac number, because 669543 - 2⁴ = 669527 is a prime.

It is a super-3 number, since 3×669543³ = 900443933373138021, which contains 333 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669543.

It is not an unprimeable number, because it can be changed into a prime (669943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15921 + ... + 15962.

It is an arithmetic number, because the mean of its divisors is an integer number (127536).

2⁶⁶⁹⁵⁴³ is an apocalyptic number.

669543 is a deficient number, since it is larger than the sum of its proper divisors (350745).

669543 is a wasteful number, since it uses less digits than its factorization.

669543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31893.

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

The square root of 669543 is about 818.2560723881. The cubic root of 669543 is about 87.4835016513.

The spelling of 669543 in words is "six hundred sixty-nine thousand, five hundred forty-three".