65664604723 has 2 divisors, whose sum is σ = 65664604724. Its totient is φ = 65664604722.

The previous prime is 65664604589. The next prime is 65664604727. The reversal of 65664604723 is 32740646656.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65664604723 - 2⁹ = 65664604211 is a prime.

It is not a weakly prime, because it can be changed into another prime (65664604727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32832302361 + 32832302362.

It is an arithmetic number, because the mean of its divisors is an integer number (32832302362).

Almost surely, 2^65664604723 is an apocalyptic number.

65664604723 is a deficient number, since it is larger than the sum of its proper divisors (1).

65664604723 is an equidigital number, since it uses as much as digits as its factorization.

65664604723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 49.

The spelling of 65664604723 in words is "sixty-five billion, six hundred sixty-four million, six hundred four thousand, seven hundred twenty-three".