18217180800001 has 2 divisors, whose sum is σ = 18217180800002. Its totient is φ = 18217180800000.

The previous prime is 18217180799971. The next prime is 18217180800029. The reversal of 18217180800001 is 10000808171281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18185525273601 + 31655526400 = 4264449^2 + 177920^2 .

It is a cyclic number.

It is not a de Polignac number, because 18217180800001 - 2¹³ = 18217180791809 is a prime.

It is not a weakly prime, because it can be changed into another prime (18217180800031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9108590400000 + 9108590400001.

It is an arithmetic number, because the mean of its divisors is an integer number (9108590400001).

Almost surely, 2^{18217180800001} is an apocalyptic number.

It is an amenable number.

18217180800001 is a deficient number, since it is larger than the sum of its proper divisors (1).

18217180800001 is an equidigital number, since it uses as much as digits as its factorization.

18217180800001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 37.

Adding to 18217180800001 its reverse (10000808171281), we get a palindrome (28217988971282).

The spelling of 18217180800001 in words is "eighteen trillion, two hundred seventeen billion, one hundred eighty million, eight hundred thousand, one".