11980209911 has 4 divisors (see below), whose sum is σ = 11981545800. Its totient is φ = 11978874024.

The previous prime is 11980209889. The next prime is 11980209929. The reversal of 11980209911 is 11990208911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11990208911 = 1523 ⋅7872757.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11980209911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11980209991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 654401 + ... + 672458.

It is an arithmetic number, because the mean of its divisors is an integer number (2995386450).

Almost surely, 2^11980209911 is an apocalyptic number.

11980209911 is a deficient number, since it is larger than the sum of its proper divisors (1335889).

11980209911 is an equidigital number, since it uses as much as digits as its factorization.

11980209911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335888.

The product of its (nonzero) digits is 11664, while the sum is 41.

The spelling of 11980209911 in words is "eleven billion, nine hundred eighty million, two hundred nine thousand, nine hundred eleven".