18238204553 has 2 divisors, whose sum is σ = 18238204554. Its totient is φ = 18238204552.

The previous prime is 18238204547. The next prime is 18238204561. The reversal of 18238204553 is 35540283281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16294011904 + 1944192649 = 127648^2 + 44093^2 .

It is a cyclic number.

It is not a de Polignac number, because 18238204553 - 2⁶ = 18238204489 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18238204553.

It is not a weakly prime, because it can be changed into another prime (18238207553) 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, 9119102276 + 9119102277.

It is an arithmetic number, because the mean of its divisors is an integer number (9119102277).

Almost surely, 2^18238204553 is an apocalyptic number.

It is an amenable number.

18238204553 is a deficient number, since it is larger than the sum of its proper divisors (1).

18238204553 is an equidigital number, since it uses as much as digits as its factorization.

18238204553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 18238204553 in words is "eighteen billion, two hundred thirty-eight million, two hundred four thousand, five hundred fifty-three".