6647227399 has 2 divisors, whose sum is σ = 6647227400. Its totient is φ = 6647227398.

The previous prime is 6647227393. The next prime is 6647227469. The reversal of 6647227399 is 9937227466.

It is a happy number.

6647227399 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6647227399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6647227393) 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, 3323613699 + 3323613700.

It is an arithmetic number, because the mean of its divisors is an integer number (3323613700).

Almost surely, 2^6647227399 is an apocalyptic number.

6647227399 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647227399 is an equidigital number, since it uses as much as digits as its factorization.

6647227399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 55.

The square root of 6647227399 is about 81530.5304717196. The cubic root of 6647227399 is about 1880.2409717336.

The spelling of 6647227399 in words is "six billion, six hundred forty-seven million, two hundred twenty-seven thousand, three hundred ninety-nine".