1668942245 has 8 divisors (see below), whose sum is σ = 2014308216. Its totient is φ = 1327435456.

The previous prime is 1668942221. The next prime is 1668942271. The reversal of 1668942245 is 5422498661.

It can be written as a sum of positive squares in 4 ways, for example, as 282273601 + 1386668644 = 16801^2 + 37238^2 .

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 1668942245 - 2⁶ = 1668942181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1668942245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 963842 + ... + 965571.

It is an arithmetic number, because the mean of its divisors is an integer number (251788527).

Almost surely, 2^1668942245 is an apocalyptic number.

It is an amenable number.

1668942245 is a deficient number, since it is larger than the sum of its proper divisors (345365971).

1668942245 is a wasteful number, since it uses less digits than its factorization.

1668942245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929591.

The product of its digits is 829440, while the sum is 47.

The square root of 1668942245 is about 40852.6895687420. The cubic root of 1668942245 is about 1186.1704553919.

The spelling of 1668942245 in words is "one billion, six hundred sixty-eight million, nine hundred forty-two thousand, two hundred forty-five".