9856838881 has 4 divisors (see below), whose sum is σ = 9911905200. Its totient is φ = 9801772564.

The previous prime is 9856838863. The next prime is 9856838891. The reversal of 9856838881 is 1888386589.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1888386589 = 241 ⋅7835629.

It is a cyclic number.

It is not a de Polignac number, because 9856838881 - 2²³ = 9848450273 is a prime.

It is a super-2 number, since 2×9856838881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9856838801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27532891 + ... + 27533248.

It is an arithmetic number, because the mean of its divisors is an integer number (2477976300).

Almost surely, 2^9856838881 is an apocalyptic number.

It is an amenable number.

9856838881 is a deficient number, since it is larger than the sum of its proper divisors (55066319).

9856838881 is a wasteful number, since it uses less digits than its factorization.

9856838881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55066318.

The product of its digits is 26542080, while the sum is 64.

The square root of 9856838881 is about 99281.6140128675. The cubic root of 9856838881 is about 2144.1041918420.

The spelling of 9856838881 in words is "nine billion, eight hundred fifty-six million, eight hundred thirty-eight thousand, eight hundred eighty-one".