669824479 has 4 divisors (see below), whose sum is σ = 676729984. Its totient is φ = 662918976.

The previous prime is 669824453. The next prime is 669824483. The reversal of 669824479 is 974428966.

It is a happy number.

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 669824479 - 2¹¹ = 669822431 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 (669824179) 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, 3452607 + ... + 3452800.

It is an arithmetic number, because the mean of its divisors is an integer number (169182496).

Almost surely, 2^669824479 is an apocalyptic number.

669824479 is a deficient number, since it is larger than the sum of its proper divisors (6905505).

669824479 is an equidigital number, since it uses as much as digits as its factorization.

669824479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6905504.

The product of its digits is 5225472, while the sum is 55.

The square root of 669824479 is about 25880.9675050992. The cubic root of 669824479 is about 874.9575942442.

The spelling of 669824479 in words is "six hundred sixty-nine million, eight hundred twenty-four thousand, four hundred seventy-nine".