18871705539 has 20 divisors (see below), whose sum is σ = 28846677816. Its totient is φ = 12288550176.

The previous prime is 18871705513. The next prime is 18871705553. The reversal of 18871705539 is 93550717881.

It is a happy number.

18871705539 is a `hidden beast` number, since 1 + 8 + 87 + 1 + 7 + 0 + 553 + 9 = 666.

It is not a de Polignac number, because 18871705539 - 2²³ = 18863316931 is a prime.

It is a super-2 number, since 2×18871705539² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18871705339) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2705634 + ... + 2712599.

Almost surely, 2^18871705539 is an apocalyptic number.

18871705539 is a deficient number, since it is larger than the sum of its proper divisors (9974972277).

18871705539 is an equidigital number, since it uses as much as digits as its factorization.

18871705539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5418288 (or 5418279 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 54.

The spelling of 18871705539 in words is "eighteen billion, eight hundred seventy-one million, seven hundred five thousand, five hundred thirty-nine".