664460243 has 2 divisors, whose sum is σ = 664460244. Its totient is φ = 664460242.

The previous prime is 664460233. The next prime is 664460281. The reversal of 664460243 is 342064466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664460243 - 2¹⁰ = 664459219 is a prime.

It is not a weakly prime, because it can be changed into another prime (664460233) 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, 332230121 + 332230122.

It is an arithmetic number, because the mean of its divisors is an integer number (332230122).

Almost surely, 2^664460243 is an apocalyptic number.

664460243 is a deficient number, since it is larger than the sum of its proper divisors (1).

664460243 is an equidigital number, since it uses as much as digits as its factorization.

664460243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 35.

The square root of 664460243 is about 25777.1263526406. The cubic root of 664460243 is about 872.6156552569.

The spelling of 664460243 in words is "six hundred sixty-four million, four hundred sixty thousand, two hundred forty-three".