11391138544 has 10 divisors (see below), whose sum is σ = 22070330960. Its totient is φ = 5695569264.

The previous prime is 11391138481. The next prime is 11391138581. The reversal of 11391138544 is 44583119311.

It is a junction number, because it is equal to n+sod(n) for n = 11391138497 and 11391138506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 355973064 + ... + 355973095.

It is an arithmetic number, because the mean of its divisors is an integer number (2207033096).

Almost surely, 2^11391138544 is an apocalyptic number.

It is an amenable number.

11391138544 is a deficient number, since it is larger than the sum of its proper divisors (10679192416).

11391138544 is an equidigital number, since it uses as much as digits as its factorization.

11391138544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711946167 (or 711946161 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The spelling of 11391138544 in words is "eleven billion, three hundred ninety-one million, one hundred thirty-eight thousand, five hundred forty-four".