18120954617 has 2 divisors, whose sum is σ = 18120954618. Its totient is φ = 18120954616.

The previous prime is 18120954581. The next prime is 18120954629. The reversal of 18120954617 is 71645902181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13423771321 + 4697183296 = 115861^2 + 68536^2 .

It is a cyclic number.

It is not a de Polignac number, because 18120954617 - 2⁸ = 18120954361 is a prime.

It is not a weakly prime, because it can be changed into another prime (18120954017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9060477308 + 9060477309.

It is an arithmetic number, because the mean of its divisors is an integer number (9060477309).

Almost surely, 2^18120954617 is an apocalyptic number.

It is an amenable number.

18120954617 is a deficient number, since it is larger than the sum of its proper divisors (1).

18120954617 is an equidigital number, since it uses as much as digits as its factorization.

18120954617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 18120954617 in words is "eighteen billion, one hundred twenty million, nine hundred fifty-four thousand, six hundred seventeen".