8691807681 has 8 divisors (see below), whose sum is σ = 12876752160. Its totient is φ = 5794538436.

The previous prime is 8691807679. The next prime is 8691807701. The reversal of 8691807681 is 1867081968.

8691807681 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 8691807681 - 2¹ = 8691807679 is a prime.

It is a super-2 number, since 2×8691807681² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8691807671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160959375 + ... + 160959428.

It is an arithmetic number, because the mean of its divisors is an integer number (1609594020).

Almost surely, 2^8691807681 is an apocalyptic number.

It is an amenable number.

8691807681 is a deficient number, since it is larger than the sum of its proper divisors (4184944479).

8691807681 is a wasteful number, since it uses less digits than its factorization.

8691807681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321918812 (or 321918806 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 8691807681 is about 93229.8647483734. The cubic root of 8691807681 is about 2056.0643492788.

The spelling of 8691807681 in words is "eight billion, six hundred ninety-one million, eight hundred seven thousand, six hundred eighty-one".