8440668691 has 32 divisors (see below), whose sum is σ = 11113200000. Its totient is φ = 6220578816.

The previous prime is 8440668683. The next prime is 8440668707. The reversal of 8440668691 is 1968660448.

8440668691 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 8440668691 - 2³ = 8440668683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8440668601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121935 + ... + 178183.

It is an arithmetic number, because the mean of its divisors is an integer number (347287500).

Almost surely, 2^8440668691 is an apocalyptic number.

8440668691 is a deficient number, since it is larger than the sum of its proper divisors (2672531309).

8440668691 is a wasteful number, since it uses less digits than its factorization.

8440668691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56383.

The product of its (nonzero) digits is 1990656, while the sum is 52.

The square root of 8440668691 is about 91873.1119044087. Note that the first 3 decimals coincide. The cubic root of 8440668691 is about 2036.0680294589.

The spelling of 8440668691 in words is "eight billion, four hundred forty million, six hundred sixty-eight thousand, six hundred ninety-one".