11391517787744 has 96 divisors (see below), whose sum is σ = 25053831139680. Its totient is φ = 5066840604672.

The previous prime is 11391517787743. The next prime is 11391517787779. The reversal of 11391517787744 is 44778771519311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11391517787743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3202832 + ... + 5748144.

It is an arithmetic number, because the mean of its divisors is an integer number (260977407705).

Almost surely, 2^{11391517787744} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11391517787744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12526915569840).

11391517787744 is an abundant number, since it is smaller than the sum of its proper divisors (13662313351936).

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

11391517787744 is a wasteful number, since it uses less digits than its factorization.

11391517787744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545792 (or 2545784 counting only the distinct ones).

The product of its digits is 41489280, while the sum is 65.

The spelling of 11391517787744 in words is "eleven trillion, three hundred ninety-one billion, five hundred seventeen million, seven hundred eighty-seven thousand, seven hundred forty-four".