669567 has 8 divisors (see below), whose sum is σ = 896896. Its totient is φ = 444312.

The previous prime is 669551. The next prime is 669577. The reversal of 669567 is 765966.

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 669567 - 2⁴ = 669551 is a prime.

It is a Duffinian number.

669567 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669527) 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, 558 + ... + 1284.

It is an arithmetic number, because the mean of its divisors is an integer number (112112).

2⁶⁶⁹⁵⁶⁷ is an apocalyptic number.

669567 is a deficient number, since it is larger than the sum of its proper divisors (227329).

669567 is a wasteful number, since it uses less digits than its factorization.

669567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037.

The product of its digits is 68040, while the sum is 39.

The square root of 669567 is about 818.2707375924. The cubic root of 669567 is about 87.4845469309.

The spelling of 669567 in words is "six hundred sixty-nine thousand, five hundred sixty-seven".