11199121648 has 120 divisors (see below), whose sum is σ = 26180395776. Its totient is φ = 4598380800.

The previous prime is 11199121643. The next prime is 11199121649. The reversal of 11199121648 is 84612199111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11199121643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1393963 + ... + 1401973.

Almost surely, 2^11199121648 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 11199121648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13090197888).

11199121648 is an abundant number, since it is smaller than the sum of its proper divisors (14981274128).

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

11199121648 is a wasteful number, since it uses less digits than its factorization.

11199121648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8103 (or 8084 counting only the distinct ones).

The product of its digits is 31104, while the sum is 43.

The spelling of 11199121648 in words is "eleven billion, one hundred ninety-nine million, one hundred twenty-one thousand, six hundred forty-eight".