18643711813605 has 48 divisors (see below), whose sum is σ = 32386894562880. Its totient is φ = 9921441164544.

The previous prime is 18643711813567. The next prime is 18643711813619. The reversal of 18643711813605 is 50631811734681.

18643711813605 is a `hidden beast` number, since 1 + 8 + 6 + 4 + 3 + 7 + 1 + 18 + 13 + 605 = 666.

It is not a de Polignac number, because 18643711813605 - 2³⁰ = 18642638071781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 66640906 + ... + 66920084.

It is an arithmetic number, because the mean of its divisors is an integer number (674726970060).

Almost surely, 2^{18643711813605} is an apocalyptic number.

18643711813605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18643711813605 is a deficient number, since it is larger than the sum of its proper divisors (13743182749275).

18643711813605 is a wasteful number, since it uses less digits than its factorization.

18643711813605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282450 (or 282447 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 18643711813605 in words is "eighteen trillion, six hundred forty-three billion, seven hundred eleven million, eight hundred thirteen thousand, six hundred five".