7938656771 has 2 divisors, whose sum is σ = 7938656772. Its totient is φ = 7938656770.

The previous prime is 7938656699. The next prime is 7938656773. The reversal of 7938656771 is 1776568397.

It is a strong prime.

It is an emirp because it is prime and its reverse (1776568397) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7938656771 - 2²⁶ = 7871547907 is a prime.

Together with 7938656773, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7938656771.

It is not a weakly prime, because it can be changed into another prime (7938656773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3969328385 + 3969328386.

It is an arithmetic number, because the mean of its divisors is an integer number (3969328386).

Almost surely, 2^7938656771 is an apocalyptic number.

7938656771 is a deficient number, since it is larger than the sum of its proper divisors (1).

7938656771 is an equidigital number, since it uses as much as digits as its factorization.

7938656771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13335840, while the sum is 59.

The square root of 7938656771 is about 89099.1401249193. The cubic root of 7938656771 is about 1994.8749423601.

The spelling of 7938656771 in words is "seven billion, nine hundred thirty-eight million, six hundred fifty-six thousand, seven hundred seventy-one".