11591638791 has 16 divisors (see below), whose sum is σ = 15489154944. Its totient is φ = 7710961824.

The previous prime is 11591638781. The next prime is 11591638813. The reversal of 11591638791 is 19783619511.

It is not a de Polignac number, because 11591638791 - 2¹⁰ = 11591637767 is a prime.

It is a super-4 number, since 4×11591638791⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11591638741) 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 15 ways as a sum of consecutive naturals, for example, 4916785 + ... + 4919141.

It is an arithmetic number, because the mean of its divisors is an integer number (968072184).

Almost surely, 2^11591638791 is an apocalyptic number.

11591638791 is a deficient number, since it is larger than the sum of its proper divisors (3897516153).

11591638791 is a wasteful number, since it uses less digits than its factorization.

11591638791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5230.

The product of its digits is 408240, while the sum is 51.

The spelling of 11591638791 in words is "eleven billion, five hundred ninety-one million, six hundred thirty-eight thousand, seven hundred ninety-one".