669708689 has 8 divisors (see below), whose sum is σ = 734833512. Its totient is φ = 606528000.

The previous prime is 669708667. The next prime is 669708737. The reversal of 669708689 is 986807966.

It can be written as a sum of positive squares in 4 ways, for example, as 120275089 + 549433600 = 10967^2 + 23440^2 .

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

It is not a de Polignac number, because 669708689 - 2¹⁶ = 669643153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669704689) 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, 485312 + ... + 486689.

It is an arithmetic number, because the mean of its divisors is an integer number (91854189).

Almost surely, 2^669708689 is an apocalyptic number.

It is an amenable number.

669708689 is a deficient number, since it is larger than the sum of its proper divisors (65124823).

669708689 is a wasteful number, since it uses less digits than its factorization.

669708689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972067.

The product of its (nonzero) digits is 7838208, while the sum is 59.

The square root of 669708689 is about 25878.7304364028. The cubic root of 669708689 is about 874.9071744794.

The spelling of 669708689 in words is "six hundred sixty-nine million, seven hundred eight thousand, six hundred eighty-nine".