669559 has 4 divisors (see below), whose sum is σ = 730440. Its totient is φ = 608680.

The previous prime is 669551. The next prime is 669577. The reversal of 669559 is 955966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 669559 - 2³ = 669551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30424 + ... + 30445.

It is an arithmetic number, because the mean of its divisors is an integer number (182610).

2⁶⁶⁹⁵⁵⁹ is an apocalyptic number.

669559 is a deficient number, since it is larger than the sum of its proper divisors (60881).

669559 is a wasteful number, since it uses less digits than its factorization.

669559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60880.

The product of its digits is 72900, while the sum is 40.

The square root of 669559 is about 818.2658492202. The cubic root of 669559 is about 87.4841985071.

The spelling of 669559 in words is "six hundred sixty-nine thousand, five hundred fifty-nine".