1668355093 has 4 divisors (see below), whose sum is σ = 1668978220. Its totient is φ = 1667731968.

The previous prime is 1668355009. The next prime is 1668355153. The reversal of 1668355093 is 3905538661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3905538661 = 8837 ⋅441953.

It can be written as a sum of positive squares in 2 ways, for example, as 136258929 + 1532096164 = 11673^2 + 39142^2 .

It is a cyclic number.

It is not a de Polignac number, because 1668355093 - 2¹⁷ = 1668224021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668359093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307530 + ... + 312907.

It is an arithmetic number, because the mean of its divisors is an integer number (417244555).

Almost surely, 2^1668355093 is an apocalyptic number.

It is an amenable number.

1668355093 is a deficient number, since it is larger than the sum of its proper divisors (623127).

1668355093 is an equidigital number, since it uses as much as digits as its factorization.

1668355093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623126.

The product of its (nonzero) digits is 583200, while the sum is 46.

The square root of 1668355093 is about 40845.5027267385. The cubic root of 1668355093 is about 1186.0313365283.

The spelling of 1668355093 in words is "one billion, six hundred sixty-eight million, three hundred fifty-five thousand, ninety-three".