6668857 has 4 divisors (see below), whose sum is σ = 7181860. Its totient is φ = 6155856.

The previous prime is 6668839. The next prime is 6668861. The reversal of 6668857 is 7588666.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4247721 + 2421136 = 2061^2 + 1556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6668857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6668807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256482 + ... + 256507.

It is an arithmetic number, because the mean of its divisors is an integer number (1795465).

Almost surely, 2^6668857 is an apocalyptic number.

It is an amenable number.

6668857 is a deficient number, since it is larger than the sum of its proper divisors (513003).

6668857 is a wasteful number, since it uses less digits than its factorization.

6668857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513002.

The product of its digits is 483840, while the sum is 46.

The square root of 6668857 is about 2582.4130188643. The cubic root of 6668857 is about 188.2278153451.

The spelling of 6668857 in words is "six million, six hundred sixty-eight thousand, eight hundred fifty-seven".