18366563723 has 2 divisors, whose sum is σ = 18366563724. Its totient is φ = 18366563722.

The previous prime is 18366563701. The next prime is 18366563777. The reversal of 18366563723 is 32736566381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18366563723 - 2⁶ = 18366563659 is a prime.

It is not a weakly prime, because it can be changed into another prime (18366563323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9183281861 + 9183281862.

It is an arithmetic number, because the mean of its divisors is an integer number (9183281862).

Almost surely, 2^18366563723 is an apocalyptic number.

18366563723 is a deficient number, since it is larger than the sum of its proper divisors (1).

18366563723 is an equidigital number, since it uses as much as digits as its factorization.

18366563723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 50.

The spelling of 18366563723 in words is "eighteen billion, three hundred sixty-six million, five hundred sixty-three thousand, seven hundred twenty-three".