1668335005 has 4 divisors (see below), whose sum is σ = 2002002012. Its totient is φ = 1334668000.

The previous prime is 1668334999. The next prime is 1668335023. The reversal of 1668335005 is 5005338661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5005338661 = 1237 ⋅4046353.

It can be written as a sum of positive squares in 2 ways, for example, as 198302724 + 1470032281 = 14082^2 + 38341^2 .

It is not a de Polignac number, because 1668335005 - 2¹³ = 1668326813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166833496 + ... + 166833505.

It is an arithmetic number, because the mean of its divisors is an integer number (500500503).

Almost surely, 2^1668335005 is an apocalyptic number.

It is an amenable number.

1668335005 is a deficient number, since it is larger than the sum of its proper divisors (333667007).

1668335005 is an equidigital number, since it uses as much as digits as its factorization.

1668335005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333667006.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 1668335005 is about 40845.2568237733. The cubic root of 1668335005 is about 1186.0265763320.

The spelling of 1668335005 in words is "one billion, six hundred sixty-eight million, three hundred thirty-five thousand, five".