6668081 has 4 divisors (see below), whose sum is σ = 7620672. Its totient is φ = 5715492.

The previous prime is 6668059. The next prime is 6668083. The reversal of 6668081 is 1808666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6668081 - 2²² = 2473777 is a prime.

It is a super-2 number, since 2×6668081² = 88926608445122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6668083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476285 + ... + 476298.

It is an arithmetic number, because the mean of its divisors is an integer number (1905168).

Almost surely, 2^6668081 is an apocalyptic number.

It is an amenable number.

6668081 is a deficient number, since it is larger than the sum of its proper divisors (952591).

6668081 is an equidigital number, since it uses as much as digits as its factorization.

6668081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952590.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 6668081 is about 2582.2627674193. The cubic root of 6668081 is about 188.2205142214.

The spelling of 6668081 in words is "six million, six hundred sixty-eight thousand, eighty-one".