18605840013 has 6 divisors (see below), whose sum is σ = 26875102254. Its totient is φ = 12403893336.

The previous prime is 18605839957. The next prime is 18605840021. The reversal of 18605840013 is 31004850681.

18605840013 is a `hidden beast` number, since 1 + 8 + 60 + 584 + 0 + 0 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17444598084 + 1161241929 = 132078^2 + 34077^2 .

It is not a de Polignac number, because 18605840013 - 2³⁰ = 17532098189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18605840013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18605840023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1033657770 + ... + 1033657787.

It is an arithmetic number, because the mean of its divisors is an integer number (4479183709).

Almost surely, 2^18605840013 is an apocalyptic number.

It is an amenable number.

18605840013 is a deficient number, since it is larger than the sum of its proper divisors (8269262241).

18605840013 is a wasteful number, since it uses less digits than its factorization.

18605840013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2067315563 (or 2067315560 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 18605840013 in words is "eighteen billion, six hundred five million, eight hundred forty thousand, thirteen".