18705709853 has 8 divisors (see below), whose sum is σ = 18880650360. Its totient is φ = 18530830080.

The previous prime is 18705709831. The next prime is 18705709877. The reversal of 18705709853 is 35890750781.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3232804 + 18702477049 = 1798^2 + 136757^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18705709853 is a prime.

It is a super-2 number, since 2×18705709853² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18705709795 and 18705709804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18705709453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 812801 + ... + 835497.

It is an arithmetic number, because the mean of its divisors is an integer number (2360081295).

Almost surely, 2^18705709853 is an apocalyptic number.

It is an amenable number.

18705709853 is a deficient number, since it is larger than the sum of its proper divisors (174940507).

18705709853 is a wasteful number, since it uses less digits than its factorization.

18705709853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30367.

The product of its (nonzero) digits is 2116800, while the sum is 53.

The spelling of 18705709853 in words is "eighteen billion, seven hundred five million, seven hundred nine thousand, eight hundred fifty-three".