11691813504 has 128 divisors (see below), whose sum is σ = 35552695680. Its totient is φ = 3334901760.

The previous prime is 11691813473. The next prime is 11691813527. The reversal of 11691813504 is 40531819611.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1751934 + ... + 1758594.

It is an arithmetic number, because the mean of its divisors is an integer number (277755435).

Almost surely, 2^11691813504 is an apocalyptic number.

11691813504 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11691813504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17776347840).

11691813504 is an abundant number, since it is smaller than the sum of its proper divisors (23860882176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11691813504 is an equidigital number, since it uses as much as digits as its factorization.

11691813504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7338 (or 7326 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The spelling of 11691813504 in words is "eleven billion, six hundred ninety-one million, eight hundred thirteen thousand, five hundred four".