11100009978 has 48 divisors (see below), whose sum is σ = 24865241856. Its totient is φ = 3574964160.

The previous prime is 11100009941. The next prime is 11100009979. The reversal of 11100009978 is 87990000111.

It is not an unprimeable number, because it can be changed into a prime (11100009979) 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, 343326 + ... + 374262.

It is an arithmetic number, because the mean of its divisors is an integer number (518025872).

Almost surely, 2^11100009978 is an apocalyptic number.

11100009978 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 11100009978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12432620928).

11100009978 is an abundant number, since it is smaller than the sum of its proper divisors (13765231878).

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

11100009978 is a wasteful number, since it uses less digits than its factorization.

11100009978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31619 (or 31616 counting only the distinct ones).

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

The spelling of 11100009978 in words is "eleven billion, one hundred million, nine thousand, nine hundred seventy-eight".