11056561780 has 48 divisors (see below), whose sum is σ = 25575548544. Its totient is φ = 3981525120.

The previous prime is 11056561777. The next prime is 11056561787. The reversal of 11056561780 is 8716565011.

11056561780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11056561787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221307 + ... + 266626.

It is an arithmetic number, because the mean of its divisors is an integer number (532823928).

Almost surely, 2^11056561780 is an apocalyptic number.

11056561780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11056561780 is an abundant number, since it is smaller than the sum of its proper divisors (14518986764).

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

11056561780 is a wasteful number, since it uses less digits than its factorization.

11056561780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488056 (or 488054 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 40.

The spelling of 11056561780 in words is "eleven billion, fifty-six million, five hundred sixty-one thousand, seven hundred eighty".