669558 has 8 divisors (see below), whose sum is σ = 1339128. Its totient is φ = 223184.

The previous prime is 669551. The next prime is 669577. The reversal of 669558 is 855966.

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

669558 is an admirable 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55791 + ... + 55802.

It is an arithmetic number, because the mean of its divisors is an integer number (167391).

2⁶⁶⁹⁵⁵⁸ is an apocalyptic number.

669558 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669558 is a wasteful number, since it uses less digits than its factorization.

669558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111598.

The product of its digits is 64800, while the sum is 39.

The square root of 669558 is about 818.2652381716. The cubic root of 669558 is about 87.4841549540.

The spelling of 669558 in words is "six hundred sixty-nine thousand, five hundred fifty-eight".