11965656911 has 16 divisors (see below), whose sum is σ = 13418784960. Its totient is φ = 10593676800.

The previous prime is 11965656893. The next prime is 11965656949.

11965656911 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-11965656911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11965656911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11965656511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48170 + ... + 162023.

It is an arithmetic number, because the mean of its divisors is an integer number (838674060).

Almost surely, 2^11965656911 is an apocalyptic number.

11965656911 is a deficient number, since it is larger than the sum of its proper divisors (1453128049).

11965656911 is a wasteful number, since it uses less digits than its factorization.

11965656911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210386.

The product of its digits is 437400, while the sum is 50.

The spelling of 11965656911 in words is "eleven billion, nine hundred sixty-five million, six hundred fifty-six thousand, nine hundred eleven".