18363755573 has 2 divisors, whose sum is σ = 18363755574. Its totient is φ = 18363755572.

The previous prime is 18363755563. The next prime is 18363755581. The reversal of 18363755573 is 37555736381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16856607889 + 1507147684 = 129833^2 + 38822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18363755573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18363755503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9181877786 + 9181877787.

It is an arithmetic number, because the mean of its divisors is an integer number (9181877787).

Almost surely, 2^18363755573 is an apocalyptic number.

It is an amenable number.

18363755573 is a deficient number, since it is larger than the sum of its proper divisors (1).

18363755573 is an equidigital number, since it uses as much as digits as its factorization.

18363755573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7938000, while the sum is 53.

The spelling of 18363755573 in words is "eighteen billion, three hundred sixty-three million, seven hundred fifty-five thousand, five hundred seventy-three".