11965856911 has 2 divisors, whose sum is σ = 11965856912. Its totient is φ = 11965856910.

The previous prime is 11965856891. The next prime is 11965856921.

11965856911 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 11965856911 - 2⁷ = 11965856783 is a prime.

It is a super-2 number, since 2×11965856911² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11965856921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5982928455 + 5982928456.

It is an arithmetic number, because the mean of its divisors is an integer number (5982928456).

Almost surely, 2^11965856911 is an apocalyptic number.

11965856911 is a deficient number, since it is larger than the sum of its proper divisors (1).

11965856911 is an equidigital number, since it uses as much as digits as its factorization.

11965856911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 52.

The spelling of 11965856911 in words is "eleven billion, nine hundred sixty-five million, eight hundred fifty-six thousand, nine hundred eleven".