11955811771 has 2 divisors, whose sum is σ = 11955811772. Its totient is φ = 11955811770.

The previous prime is 11955811753. The next prime is 11955811873. The reversal of 11955811771 is 17711855911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11955811771 - 2²⁹ = 11418940859 is a prime.

It is not a weakly prime, because it can be changed into another prime (11955821771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5977905885 + 5977905886.

It is an arithmetic number, because the mean of its divisors is an integer number (5977905886).

Almost surely, 2^11955811771 is an apocalyptic number.

11955811771 is a deficient number, since it is larger than the sum of its proper divisors (1).

11955811771 is an equidigital number, since it uses as much as digits as its factorization.

11955811771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88200, while the sum is 46.

The spelling of 11955811771 in words is "eleven billion, nine hundred fifty-five million, eight hundred eleven thousand, seven hundred seventy-one".