6669857 has 2 divisors, whose sum is σ = 6669858. Its totient is φ = 6669856.

The previous prime is 6669853. The next prime is 6669863. The reversal of 6669857 is 7589666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4734976 + 1934881 = 2176^2 + 1391^2 .

It is a cyclic number.

It is not a de Polignac number, because 6669857 - 2² = 6669853 is a prime.

It is not a weakly prime, because it can be changed into another prime (6669853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3334928 + 3334929.

It is an arithmetic number, because the mean of its divisors is an integer number (3334929).

Almost surely, 2^6669857 is an apocalyptic number.

It is an amenable number.

6669857 is a deficient number, since it is larger than the sum of its proper divisors (1).

6669857 is an equidigital number, since it uses as much as digits as its factorization.

6669857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 6669857 is about 2582.6066289700. The cubic root of 6669857 is about 188.2372231745.

The spelling of 6669857 in words is "six million, six hundred sixty-nine thousand, eight hundred fifty-seven".