669821289 has 8 divisors (see below), whose sum is σ = 893314752. Its totient is φ = 446437680.

The previous prime is 669821281. The next prime is 669821293. The reversal of 669821289 is 982128966.

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

It is not a de Polignac number, because 669821289 - 2³ = 669821281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669821281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11989 + ... + 38514.

It is an arithmetic number, because the mean of its divisors is an integer number (111664344).

Almost surely, 2^669821289 is an apocalyptic number.

It is an amenable number.

669821289 is a deficient number, since it is larger than the sum of its proper divisors (223493463).

669821289 is a wasteful number, since it uses less digits than its factorization.

669821289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54927.

The product of its digits is 746496, while the sum is 51.

The square root of 669821289 is about 25880.9058767270. The cubic root of 669821289 is about 874.9562052638.

The spelling of 669821289 in words is "six hundred sixty-nine million, eight hundred twenty-one thousand, two hundred eighty-nine".