18385517017 has 24 divisors (see below), whose sum is σ = 22664274336. Its totient is φ = 14819591808.

The previous prime is 18385516997. The next prime is 18385517093. The reversal of 18385517017 is 71071558381.

It is not a de Polignac number, because 18385517017 - 2²⁷ = 18251299289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18385517617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1060138 + ... + 1077340.

It is an arithmetic number, because the mean of its divisors is an integer number (944344764).

Almost surely, 2^18385517017 is an apocalyptic number.

18385517017 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18385517017 is a deficient number, since it is larger than the sum of its proper divisors (4278757319).

18385517017 is a wasteful number, since it uses less digits than its factorization.

18385517017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18517 (or 18510 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 46.

The spelling of 18385517017 in words is "eighteen billion, three hundred eighty-five million, five hundred seventeen thousand, seventeen".