669820369 has 8 divisors (see below), whose sum is σ = 677160000. Its totient is φ = 662502672.

The previous prime is 669820363. The next prime is 669820409. The reversal of 669820369 is 963028966.

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

It is a cyclic number.

It is not a de Polignac number, because 669820369 - 2⁷ = 669820241 is a prime.

It is a super-2 number, since 2×669820369² = 897318653454592322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669820363) 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, 60162 + ... + 70420.

It is an arithmetic number, because the mean of its divisors is an integer number (84645000).

Almost surely, 2^669820369 is an apocalyptic number.

It is an amenable number.

669820369 is a deficient number, since it is larger than the sum of its proper divisors (7339631).

669820369 is a wasteful number, since it uses less digits than its factorization.

669820369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10967.

The product of its (nonzero) digits is 839808, while the sum is 49.

The square root of 669820369 is about 25880.8881029999. Note that the first 3 decimals coincide. The cubic root of 669820369 is about 874.9558046793.

The spelling of 669820369 in words is "six hundred sixty-nine million, eight hundred twenty thousand, three hundred sixty-nine".