6646247 has 2 divisors, whose sum is σ = 6646248. Its totient is φ = 6646246.

The previous prime is 6646231. The next prime is 6646259. The reversal of 6646247 is 7426466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6646247 - 2⁴ = 6646231 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6646207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323123 + 3323124.

It is an arithmetic number, because the mean of its divisors is an integer number (3323124).

Almost surely, 2^6646247 is an apocalyptic number.

6646247 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646247 is an equidigital number, since it uses as much as digits as its factorization.

6646247 is an evil number, because the sum of its binary digits is even.

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

The square root of 6646247 is about 2578.0316134602. The cubic root of 6646247 is about 188.0148528329.

The spelling of 6646247 in words is "six million, six hundred forty-six thousand, two hundred forty-seven".