1668309975 has 18 divisors (see below), whose sum is σ = 2988128936. Its totient is φ = 889765200.

The previous prime is 1668309961. The next prime is 1668309989. The reversal of 1668309975 is 5799038661.

It is an interprime number because it is at equal distance from previous prime (1668309961) and next prime (1668309989).

It is not a de Polignac number, because 1668309975 - 2⁶ = 1668309911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 3707131 + ... + 3707580.

Almost surely, 2^1668309975 is an apocalyptic number.

1668309975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1668309975 is a deficient number, since it is larger than the sum of its proper divisors (1319818961).

1668309975 is a wasteful number, since it uses less digits than its factorization.

1668309975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7414727 (or 7414719 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 1668309975 is about 40844.9504222982. The cubic root of 1668309975 is about 1186.0206449906.

The spelling of 1668309975 in words is "one billion, six hundred sixty-eight million, three hundred nine thousand, nine hundred seventy-five".