6646427 has 2 divisors, whose sum is σ = 6646428. Its totient is φ = 6646426.

The previous prime is 6646417. The next prime is 6646429. The reversal of 6646427 is 7246466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6646427 - 2⁶ = 6646363 is a prime.

Together with 6646429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6646429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323213 + 3323214.

It is an arithmetic number, because the mean of its divisors is an integer number (3323214).

Almost surely, 2^6646427 is an apocalyptic number.

6646427 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646427 is an equidigital number, since it uses as much as digits as its factorization.

6646427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 35.

The square root of 6646427 is about 2578.0665235793. The cubic root of 6646427 is about 188.0165501501.

The spelling of 6646427 in words is "six million, six hundred forty-six thousand, four hundred twenty-seven".