8391808885 has 16 divisors (see below), whose sum is σ = 10193929200. Its totient is φ = 6631441920.

The previous prime is 8391808879. The next prime is 8391808897. The reversal of 8391808885 is 5888081938.

It can be written as a sum of positive squares in 8 ways, for example, as 958955089 + 7432853796 = 30967^2 + 86214^2 .

It is not a de Polignac number, because 8391808885 - 2³ = 8391808877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103729 + ... + 165961.

It is an arithmetic number, because the mean of its divisors is an integer number (637120575).

Almost surely, 2^8391808885 is an apocalyptic number.

It is an amenable number.

8391808885 is a deficient number, since it is larger than the sum of its proper divisors (1802120315).

8391808885 is a wasteful number, since it uses less digits than its factorization.

8391808885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62568.

The product of its (nonzero) digits is 4423680, while the sum is 58.

The square root of 8391808885 is about 91606.8168042095. The cubic root of 8391808885 is about 2032.1317511661.

The spelling of 8391808885 in words is "eight billion, three hundred ninety-one million, eight hundred eight thousand, eight hundred eighty-five".