18018018901 has 2 divisors, whose sum is σ = 18018018902. Its totient is φ = 18018018900.

The previous prime is 18018018881. The next prime is 18018018937. The reversal of 18018018901 is 10981081081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17877027025 + 140991876 = 133705^2 + 11874^2 .

It is a cyclic number.

It is not a de Polignac number, because 18018018901 - 2⁵ = 18018018869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18018018401) 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, 9009009450 + 9009009451.

It is an arithmetic number, because the mean of its divisors is an integer number (9009009451).

Almost surely, 2^18018018901 is an apocalyptic number.

It is an amenable number.

18018018901 is a deficient number, since it is larger than the sum of its proper divisors (1).

18018018901 is an equidigital number, since it uses as much as digits as its factorization.

18018018901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 37.

Adding to 18018018901 its reverse (10981081081), we get a palindrome (28999099982).

The spelling of 18018018901 in words is "eighteen billion, eighteen million, eighteen thousand, nine hundred one".