6668671 has 4 divisors (see below), whose sum is σ = 6678072. Its totient is φ = 6659272.

The previous prime is 6668659. The next prime is 6668687. The reversal of 6668671 is 1768666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6668671 - 2¹⁵ = 6635903 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6668611) 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, 3541 + ... + 5086.

It is an arithmetic number, because the mean of its divisors is an integer number (1669518).

Almost surely, 2^6668671 is an apocalyptic number.

6668671 is a deficient number, since it is larger than the sum of its proper divisors (9401).

6668671 is an equidigital number, since it uses as much as digits as its factorization.

6668671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9400.

The product of its digits is 72576, while the sum is 40.

The square root of 6668671 is about 2582.3770057836. The cubic root of 6668671 is about 188.2260653851.

The spelling of 6668671 in words is "six million, six hundred sixty-eight thousand, six hundred seventy-one".