18508425017 has 2 divisors, whose sum is σ = 18508425018. Its totient is φ = 18508425016.

The previous prime is 18508424993. The next prime is 18508425031. The reversal of 18508425017 is 71052480581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16700134441 + 1808290576 = 129229^2 + 42524^2 .

It is a cyclic number.

It is not a de Polignac number, because 18508425017 - 2¹⁸ = 18508162873 is a prime.

It is a super-2 number, since 2×18508425017² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18508425097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9254212508 + 9254212509.

It is an arithmetic number, because the mean of its divisors is an integer number (9254212509).

Almost surely, 2^18508425017 is an apocalyptic number.

It is an amenable number.

18508425017 is a deficient number, since it is larger than the sum of its proper divisors (1).

18508425017 is an equidigital number, since it uses as much as digits as its factorization.

18508425017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 89600, while the sum is 41.

The spelling of 18508425017 in words is "eighteen billion, five hundred eight million, four hundred twenty-five thousand, seventeen".