11991107548 has 24 divisors (see below), whose sum is σ = 24194453472. Its totient is φ = 5093566464.

The previous prime is 11991107507. The next prime is 11991107561. The reversal of 11991107548 is 84570119911.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 11991107498 and 11991107507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1891765 + ... + 1898092.

It is an arithmetic number, because the mean of its divisors is an integer number (1008102228).

Almost surely, 2^11991107548 is an apocalyptic number.

It is an amenable number.

11991107548 is an abundant number, since it is smaller than the sum of its proper divisors (12203345924).

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

11991107548 is a wasteful number, since it uses less digits than its factorization.

11991107548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789981 (or 3789979 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 46.

The spelling of 11991107548 in words is "eleven billion, nine hundred ninety-one million, one hundred seven thousand, five hundred forty-eight".