18498390017 has 4 divisors (see below), whose sum is σ = 18534733140. Its totient is φ = 18462046896.

The previous prime is 18498390011. The next prime is 18498390023. The reversal of 18498390017 is 71009389481.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18498390011) and next prime (18498390023).

It can be written as a sum of positive squares in 2 ways, for example, as 10281148816 + 8217241201 = 101396^2 + 90649^2 .

It is a cyclic number.

It is not a de Polignac number, because 18498390017 - 2⁶ = 18498389953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18498390011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18170798 + ... + 18171815.

It is an arithmetic number, because the mean of its divisors is an integer number (4633683285).

Almost surely, 2^18498390017 is an apocalyptic number.

It is an amenable number.

18498390017 is a deficient number, since it is larger than the sum of its proper divisors (36343123).

18498390017 is an equidigital number, since it uses as much as digits as its factorization.

18498390017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36343122.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 18498390017 in words is "eighteen billion, four hundred ninety-eight million, three hundred ninety thousand, seventeen".