8686640971 has 2 divisors, whose sum is σ = 8686640972. Its totient is φ = 8686640970.

The previous prime is 8686640969. The next prime is 8686641017. The reversal of 8686640971 is 1790466868.

It is a happy number.

8686640971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8686640971 - 2¹ = 8686640969 is a prime.

Together with 8686640969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8686640471) 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 as a sum of consecutive naturals, namely, 4343320485 + 4343320486.

It is an arithmetic number, because the mean of its divisors is an integer number (4343320486).

Almost surely, 2^8686640971 is an apocalyptic number.

8686640971 is a deficient number, since it is larger than the sum of its proper divisors (1).

8686640971 is an equidigital number, since it uses as much as digits as its factorization.

8686640971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 8686640971 is about 93202.1511071499. The cubic root of 8686640971 is about 2055.6568700283.

The spelling of 8686640971 in words is "eight billion, six hundred eighty-six million, six hundred forty thousand, nine hundred seventy-one".