669506 has 4 divisors (see below), whose sum is σ = 1004262. Its totient is φ = 334752.

The previous prime is 669481. The next prime is 669527. The reversal of 669506 is 605966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605966 = 2 ⋅302983.

It can be written as a sum of positive squares in only one way, i.e., 434281 + 235225 = 659^2 + 485^2 .

It is an unprimeable number.

669506 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167375 + ... + 167378.

2⁶⁶⁹⁵⁰⁶ is an apocalyptic number.

669506 is a deficient number, since it is larger than the sum of its proper divisors (334756).

669506 is a wasteful number, since it uses less digits than its factorization.

669506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334755.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 669506 is about 818.2334630165. The cubic root of 669506 is about 87.4818901296.

The spelling of 669506 in words is "six hundred sixty-nine thousand, five hundred six".