1668250917 has 8 divisors (see below), whose sum is σ = 2471482880. Its totient is φ = 1112167260.

The previous prime is 1668250873. The next prime is 1668250943. The reversal of 1668250917 is 7190528661.

1668250917 is a `hidden beast` number, since 1 + 66 + 82 + 509 + 1 + 7 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-1668250917 is a prime.

It is a super-2 number, since 2×1668250917² = 5566122244142681778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668250417) 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, 30893509 + ... + 30893562.

It is an arithmetic number, because the mean of its divisors is an integer number (308935360).

Almost surely, 2^1668250917 is an apocalyptic number.

It is an amenable number.

1668250917 is a deficient number, since it is larger than the sum of its proper divisors (803231963).

1668250917 is an equidigital number, since it uses as much as digits as its factorization.

1668250917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61787080 (or 61787074 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 1668250917 is about 40844.2274623967. The cubic root of 1668250917 is about 1186.0066498228.

The spelling of 1668250917 in words is "one billion, six hundred sixty-eight million, two hundred fifty thousand, nine hundred seventeen".