8178440809 has 16 divisors (see below), whose sum is σ = 10639825920. Its totient is φ = 6095730960.

The previous prime is 8178440791. The next prime is 8178440899. The reversal of 8178440809 is 9080448718.

8178440809 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8178440809 - 2⁹ = 8178440297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8178440899) by changing a digit.

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, 2307219 + ... + 2310760.

It is an arithmetic number, because the mean of its divisors is an integer number (664989120).

Almost surely, 2^8178440809 is an apocalyptic number.

It is an amenable number.

8178440809 is a deficient number, since it is larger than the sum of its proper divisors (2461385111).

8178440809 is a wasteful number, since it uses less digits than its factorization.

8178440809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4618020.

The product of its (nonzero) digits is 516096, while the sum is 49.

The square root of 8178440809 is about 90434.7323156319. The cubic root of 8178440809 is about 2014.7608579415.

The spelling of 8178440809 in words is "eight billion, one hundred seventy-eight million, four hundred forty thousand, eight hundred nine".