11556761800 has 24 divisors (see below), whose sum is σ = 26869471650. Its totient is φ = 4622704640.

The previous prime is 11556761791. The next prime is 11556761807. The reversal of 11556761800 is 816765511.

It can be written as a sum of positive squares in 3 ways, for example, as 10667171524 + 889590276 = 103282^2 + 29826^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (11556761807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28891705 + ... + 28892104.

Almost surely, 2^11556761800 is an apocalyptic number.

11556761800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11556761800 is an abundant number, since it is smaller than the sum of its proper divisors (15312709850).

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

11556761800 is a wasteful number, since it uses less digits than its factorization.

11556761800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57783825 (or 57783816 counting only the distinct ones).

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

The spelling of 11556761800 in words is "eleven billion, five hundred fifty-six million, seven hundred sixty-one thousand, eight hundred".