11688969778 has 4 divisors (see below), whose sum is σ = 17533454670. Its totient is φ = 5844484888.

The previous prime is 11688969713. The next prime is 11688969781. The reversal of 11688969778 is 87796988611.

11688969778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87796988611 = 3049 ⋅28795339.

It can be written as a sum of positive squares in only one way, i.e., 10686804129 + 1002165649 = 103377^2 + 31657^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2922242443 + ... + 2922242446.

Almost surely, 2^11688969778 is an apocalyptic number.

11688969778 is a deficient number, since it is larger than the sum of its proper divisors (5844484892).

11688969778 is an equidigital number, since it uses as much as digits as its factorization.

11688969778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5844484891.

The product of its digits is 73156608, while the sum is 70.

The spelling of 11688969778 in words is "eleven billion, six hundred eighty-eight million, nine hundred sixty-nine thousand, seven hundred seventy-eight".