18165389385 has 96 divisors (see below), whose sum is σ = 34642137600. Its totient is φ = 8073838080.

The previous prime is 18165389377. The next prime is 18165389387. The reversal of 18165389385 is 58398356181.

It is a happy number.

It is not a de Polignac number, because 18165389385 - 2³ = 18165389377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18165389387) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3513072 + ... + 3518238.

It is an arithmetic number, because the mean of its divisors is an integer number (360855600).

Almost surely, 2^18165389385 is an apocalyptic number.

18165389385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18165389385 is a deficient number, since it is larger than the sum of its proper divisors (16476748215).

18165389385 is a wasteful number, since it uses less digits than its factorization.

18165389385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5359 (or 5348 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 57.

The spelling of 18165389385 in words is "eighteen billion, one hundred sixty-five million, three hundred eighty-nine thousand, three hundred eighty-five".