7811666012771 has 2 divisors, whose sum is σ = 7811666012772. Its totient is φ = 7811666012770.

The previous prime is 7811666012723. The next prime is 7811666012807. The reversal of 7811666012771 is 1772106661187.

It is a strong prime.

It is an emirp because it is prime and its reverse (1772106661187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7811666012771 - 2²⁶ = 7811598903907 is a prime.

It is a super-2 number, since 2×7811666012771² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7811666032771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3905833006385 + 3905833006386.

It is an arithmetic number, because the mean of its divisors is an integer number (3905833006386).

Almost surely, 2^{7811666012771} is an apocalyptic number.

7811666012771 is a deficient number, since it is larger than the sum of its proper divisors (1).

7811666012771 is an equidigital number, since it uses as much as digits as its factorization.

7811666012771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 53.

The spelling of 7811666012771 in words is "seven trillion, eight hundred eleven billion, six hundred sixty-six million, twelve thousand, seven hundred seventy-one".