808138127189 has 4 divisors (see below), whose sum is σ = 827848813260. Its totient is φ = 788427441120.

The previous prime is 808138127149. The next prime is 808138127191. The reversal of 808138127189 is 981721831808.

808138127189 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14287420900 + 793850706289 = 119530^2 + 890983^2 .

It is a cyclic number.

It is not a de Polignac number, because 808138127189 - 2²⁰ = 808137078613 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 (808138127129) 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, 9855342974 + ... + 9855343055.

It is an arithmetic number, because the mean of its divisors is an integer number (206962203315).

Almost surely, 2^808138127189 is an apocalyptic number.

It is an amenable number.

808138127189 is a deficient number, since it is larger than the sum of its proper divisors (19710686071).

808138127189 is a wasteful number, since it uses less digits than its factorization.

808138127189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19710686070.

The product of its (nonzero) digits is 1548288, while the sum is 56.

The spelling of 808138127189 in words is "eight hundred eight billion, one hundred thirty-eight million, one hundred twenty-seven thousand, one hundred eighty-nine".