11000109978 has 192 divisors, whose sum is σ = 28771666560. Its totient is φ = 2993356800.

The previous prime is 11000109977. The next prime is 11000110003. The reversal of 11000109978 is 87990100011.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11000109977) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17160538 + ... + 17161178.

It is an arithmetic number, because the mean of its divisors is an integer number (149852430).

Almost surely, 2^11000109978 is an apocalyptic number.

11000109978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11000109978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14385833280).

11000109978 is an abundant number, since it is smaller than the sum of its proper divisors (17771556582).

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

11000109978 is a wasteful number, since it uses less digits than its factorization.

11000109978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 36.

Adding to 11000109978 its reverse (87990100011), we get a palindrome (98990209989).

The spelling of 11000109978 in words is "eleven billion, one hundred nine thousand, nine hundred seventy-eight".