11011994880 has 144 divisors (see below), whose sum is σ = 35499570624. Its totient is φ = 2908979200.

The previous prime is 11011994837. The next prime is 11011994899. The reversal of 11011994880 is 8849911011.

It is a happy number.

It is a super-3 number, since 3×11011994880³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397480 + ... + 424280.

It is an arithmetic number, because the mean of its divisors is an integer number (246524796).

Almost surely, 2^11011994880 is an apocalyptic number.

11011994880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11011994880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17749785312).

11011994880 is an abundant number, since it is smaller than the sum of its proper divisors (24487575744).

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

11011994880 is a wasteful number, since it uses less digits than its factorization.

11011994880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26932 (or 26918 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 42.

The spelling of 11011994880 in words is "eleven billion, eleven million, nine hundred ninety-four thousand, eight hundred eighty".