18316801666523 has 2 divisors, whose sum is σ = 18316801666524. Its totient is φ = 18316801666522.

The previous prime is 18316801666477. The next prime is 18316801666543. The reversal of 18316801666523 is 32566610861381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18316801666523 - 2³⁸ = 18041923759579 is a prime.

It is not a weakly prime, because it can be changed into another prime (18316801666543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9158400833261 + 9158400833262.

It is an arithmetic number, because the mean of its divisors is an integer number (9158400833262).

Almost surely, 2^{18316801666523} is an apocalyptic number.

18316801666523 is a deficient number, since it is larger than the sum of its proper divisors (1).

18316801666523 is an equidigital number, since it uses as much as digits as its factorization.

18316801666523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 18316801666523 in words is "eighteen trillion, three hundred sixteen billion, eight hundred one million, six hundred sixty-six thousand, five hundred twenty-three".