11978687911 has 4 divisors (see below), whose sum is σ = 12113280000. Its totient is φ = 11844095824.

The previous prime is 11978687893. The next prime is 11978687933.

11978687911 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11978687911 - 2¹⁷ = 11978556839 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 (11978687111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67295911 + ... + 67296088.

It is an arithmetic number, because the mean of its divisors is an integer number (3028320000).

Almost surely, 2^11978687911 is an apocalyptic number.

11978687911 is a deficient number, since it is larger than the sum of its proper divisors (134592089).

11978687911 is an equidigital number, since it uses as much as digits as its factorization.

11978687911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134592088.

The product of its digits is 1524096, while the sum is 58.

The spelling of 11978687911 in words is "eleven billion, nine hundred seventy-eight million, six hundred eighty-seven thousand, nine hundred eleven".