669441959 has 4 divisors (see below), whose sum is σ = 669617040. Its totient is φ = 669266880.

The previous prime is 669441947. The next prime is 669441961. The reversal of 669441959 is 959144966.

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 669441959 - 2⁴ = 669441943 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 669441959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669441919) 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, 81674 + ... + 89495.

It is an arithmetic number, because the mean of its divisors is an integer number (167404260).

Almost surely, 2^669441959 is an apocalyptic number.

669441959 is a deficient number, since it is larger than the sum of its proper divisors (175081).

669441959 is a wasteful number, since it uses less digits than its factorization.

669441959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175080.

The product of its digits is 2099520, while the sum is 53.

The square root of 669441959 is about 25873.5764632569. The cubic root of 669441959 is about 874.7910070658.

The spelling of 669441959 in words is "six hundred sixty-nine million, four hundred forty-one thousand, nine hundred fifty-nine".