8176640905 has 4 divisors (see below), whose sum is σ = 9811969092. Its totient is φ = 6541312720.

The previous prime is 8176640897. The next prime is 8176640911. The reversal of 8176640905 is 5090466718.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5090466718 = 2 ⋅2545233359.

It can be written as a sum of positive squares in 2 ways, for example, as 3991586041 + 4185054864 = 63179^2 + 64692^2 .

It is not a de Polignac number, because 8176640905 - 2³ = 8176640897 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 817664086 + ... + 817664095.

It is an arithmetic number, because the mean of its divisors is an integer number (2452992273).

Almost surely, 2^8176640905 is an apocalyptic number.

It is an amenable number.

8176640905 is a deficient number, since it is larger than the sum of its proper divisors (1635328187).

8176640905 is a wasteful number, since it uses less digits than its factorization.

8176640905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635328186.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 8176640905 is about 90424.7803702060. The cubic root of 8176640905 is about 2014.6130448365.

The spelling of 8176640905 in words is "eight billion, one hundred seventy-six million, six hundred forty thousand, nine hundred five".