1668609259 has 8 divisors (see below), whose sum is σ = 1674424080. Its totient is φ = 1662804000.

The previous prime is 1668609199. The next prime is 1668609287. The reversal of 1668609259 is 9529068661.

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 1668609259 - 2¹¹ = 1668607211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668609289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 543589 + ... + 546649.

It is an arithmetic number, because the mean of its divisors is an integer number (209303010).

Almost surely, 2^1668609259 is an apocalyptic number.

1668609259 is a deficient number, since it is larger than the sum of its proper divisors (5814821).

1668609259 is a wasteful number, since it uses less digits than its factorization.

1668609259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4781.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The square root of 1668609259 is about 40848.6139177329. The cubic root of 1668609259 is about 1186.0915622231.

The spelling of 1668609259 in words is "one billion, six hundred sixty-eight million, six hundred nine thousand, two hundred fifty-nine".