18009337217 has 2 divisors, whose sum is σ = 18009337218. Its totient is φ = 18009337216.

The previous prime is 18009337211. The next prime is 18009337231. The reversal of 18009337217 is 71273390081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17455958641 + 553378576 = 132121^2 + 23524^2 .

It is a cyclic number.

It is not a de Polignac number, because 18009337217 - 2¹⁰ = 18009336193 is a prime.

It is not a weakly prime, because it can be changed into another prime (18009337211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9004668608 + 9004668609.

It is an arithmetic number, because the mean of its divisors is an integer number (9004668609).

Almost surely, 2^18009337217 is an apocalyptic number.

It is an amenable number.

18009337217 is a deficient number, since it is larger than the sum of its proper divisors (1).

18009337217 is an equidigital number, since it uses as much as digits as its factorization.

18009337217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 41.

The spelling of 18009337217 in words is "eighteen billion, nine million, three hundred thirty-seven thousand, two hundred seventeen".