18003727901 has 2 divisors, whose sum is σ = 18003727902. Its totient is φ = 18003727900.

The previous prime is 18003727817. The next prime is 18003727949. The reversal of 18003727901 is 10972730081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15019728025 + 2983999876 = 122555^2 + 54626^2 .

It is a cyclic number.

It is not a de Polignac number, because 18003727901 - 2¹⁸ = 18003465757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18003727201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9001863950 + 9001863951.

It is an arithmetic number, because the mean of its divisors is an integer number (9001863951).

Almost surely, 2^18003727901 is an apocalyptic number.

It is an amenable number.

18003727901 is a deficient number, since it is larger than the sum of its proper divisors (1).

18003727901 is an equidigital number, since it uses as much as digits as its factorization.

18003727901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 38.

The spelling of 18003727901 in words is "eighteen billion, three million, seven hundred twenty-seven thousand, nine hundred one".