664612567243 has 2 divisors, whose sum is σ = 664612567244. Its totient is φ = 664612567242.

The previous prime is 664612567217. The next prime is 664612567261. The reversal of 664612567243 is 342765216466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664612567243 - 2⁹ = 664612566731 is a prime.

It is not a weakly prime, because it can be changed into another prime (664612567273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332306283621 + 332306283622.

It is an arithmetic number, because the mean of its divisors is an integer number (332306283622).

Almost surely, 2^664612567243 is an apocalyptic number.

664612567243 is a deficient number, since it is larger than the sum of its proper divisors (1).

664612567243 is an equidigital number, since it uses as much as digits as its factorization.

664612567243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 52.

The spelling of 664612567243 in words is "six hundred sixty-four billion, six hundred twelve million, five hundred sixty-seven thousand, two hundred forty-three".