669599 has 8 divisors (see below), whose sum is σ = 798720. Its totient is φ = 548856.

The previous prime is 669577. The next prime is 669607. The reversal of 669599 is 995966.

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

It is not a de Polignac number, because 669599 - 2¹² = 665503 is a prime.

It is a Duffinian 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 669599.

It is not an unprimeable number, because it can be changed into a prime (660599) 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 7 ways as a sum of consecutive naturals, for example, 1919 + ... + 2240.

It is an arithmetic number, because the mean of its divisors is an integer number (99840).

2⁶⁶⁹⁵⁹⁹ is an apocalyptic number.

669599 is a deficient number, since it is larger than the sum of its proper divisors (129121).

669599 is a wasteful number, since it uses less digits than its factorization.

669599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4189.

The product of its digits is 131220, while the sum is 44.

The square root of 669599 is about 818.2902907893. The cubic root of 669599 is about 87.4859405982.

The spelling of 669599 in words is "six hundred sixty-nine thousand, five hundred ninety-nine".