664228343 has 2 divisors, whose sum is σ = 664228344. Its totient is φ = 664228342.

The previous prime is 664228321. The next prime is 664228349. The reversal of 664228343 is 343822466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664228343 - 2¹² = 664224247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664228297 and 664228306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664228349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332114171 + 332114172.

It is an arithmetic number, because the mean of its divisors is an integer number (332114172).

Almost surely, 2^664228343 is an apocalyptic number.

664228343 is a deficient number, since it is larger than the sum of its proper divisors (1).

664228343 is an equidigital number, since it uses as much as digits as its factorization.

664228343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 38.

The square root of 664228343 is about 25772.6277860834. The cubic root of 664228343 is about 872.5141276793.

The spelling of 664228343 in words is "six hundred sixty-four million, two hundred twenty-eight thousand, three hundred forty-three".