18120046517 has 2 divisors, whose sum is σ = 18120046518. Its totient is φ = 18120046516.

The previous prime is 18120046489. The next prime is 18120046537. The reversal of 18120046517 is 71564002181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9706387441 + 8413659076 = 98521^2 + 91726^2 .

It is a cyclic number.

It is not a de Polignac number, because 18120046517 - 2³² = 13825079221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18120046537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9060023258 + 9060023259.

It is an arithmetic number, because the mean of its divisors is an integer number (9060023259).

Almost surely, 2^18120046517 is an apocalyptic number.

It is an amenable number.

18120046517 is a deficient number, since it is larger than the sum of its proper divisors (1).

18120046517 is an equidigital number, since it uses as much as digits as its factorization.

18120046517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 35.

Adding to 18120046517 its reverse (71564002181), we get a palindrome (89684048698).

The spelling of 18120046517 in words is "eighteen billion, one hundred twenty million, forty-six thousand, five hundred seventeen".