669844385 has 16 divisors (see below), whose sum is σ = 921024000. Its totient is φ = 458131776.

The previous prime is 669844379. The next prime is 669844393. The reversal of 669844385 is 583448966.

669844385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 669844385 - 2⁶ = 669844321 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10985 + ... + 38214.

It is an arithmetic number, because the mean of its divisors is an integer number (57564000).

Almost surely, 2^669844385 is an apocalyptic number.

It is an amenable number.

669844385 is a deficient number, since it is larger than the sum of its proper divisors (251179615).

669844385 is a wasteful number, since it uses less digits than its factorization.

669844385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49600.

The product of its digits is 4976640, while the sum is 53.

The square root of 669844385 is about 25881.3520705546. The cubic root of 669844385 is about 874.9662615563.

The spelling of 669844385 in words is "six hundred sixty-nine million, eight hundred forty-four thousand, three hundred eighty-five".