18835866117 has 10 divisors (see below), whose sum is σ = 28137528518. Its totient is φ = 12557244024.

The previous prime is 18835866103. The next prime is 18835866121. The reversal of 18835866117 is 71166853881.

18835866117 is a `hidden beast` number, since 18 + 8 + 3 + 5 + 8 + 6 + 611 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15249533121 + 3586332996 = 123489^2 + 59886^2 .

It is not a de Polignac number, because 18835866117 - 2²⁴ = 18819088901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18835866187) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 116270698 + ... + 116270859.

Almost surely, 2^18835866117 is an apocalyptic number.

It is an amenable number.

18835866117 is a deficient number, since it is larger than the sum of its proper divisors (9301662401).

18835866117 is an equidigital number, since it uses as much as digits as its factorization.

18835866117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232541569 (or 232541560 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 18835866117 in words is "eighteen billion, eight hundred thirty-five million, eight hundred sixty-six thousand, one hundred seventeen".