18305168640 has 144 divisors (see below), whose sum is σ = 63777018816. Its totient is φ = 4437606400.

The previous prime is 18305168603. The next prime is 18305168647. The reversal of 18305168640 is 4686150381.

It is a junction number, because it is equal to n+sod(n) for n = 18305168592 and 18305168601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18305168647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174441 + ... + 258920.

It is an arithmetic number, because the mean of its divisors is an integer number (442895964).

Almost surely, 2^18305168640 is an apocalyptic number.

18305168640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18305168640 is an abundant number, since it is smaller than the sum of its proper divisors (45471850176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18305168640 is a wasteful number, since it uses less digits than its factorization.

18305168640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433396 (or 433382 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 18305168640 in words is "eighteen billion, three hundred five million, one hundred sixty-eight thousand, six hundred forty".