669244409 has 8 divisors (see below), whose sum is σ = 711519552. Its totient is φ = 628067440.

The previous prime is 669244403. The next prime is 669244417. The reversal of 669244409 is 904442966.

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

It is not a de Polignac number, because 669244409 - 2²⁸ = 400808953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 669244409.

It is not an unprimeable number, because it can be changed into a prime (669244403) 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, 273287 + ... + 275724.

It is an arithmetic number, because the mean of its divisors is an integer number (88939944).

Almost surely, 2^669244409 is an apocalyptic number.

It is an amenable number.

669244409 is a deficient number, since it is larger than the sum of its proper divisors (42275143).

669244409 is a wasteful number, since it uses less digits than its factorization.

669244409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549087.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 669244409 is about 25869.7585802419. The cubic root of 669244409 is about 874.7049493362.

The spelling of 669244409 in words is "six hundred sixty-nine million, two hundred forty-four thousand, four hundred nine".