11543563728 has 30 divisors (see below), whose sum is σ = 32305946114. Its totient is φ = 3847854528.

The previous prime is 11543563721. The next prime is 11543563729. The reversal of 11543563728 is 82736534511.

It is a happy number.

11543563728 is a `hidden beast` number, since 1 + 1 + 5 + 4 + 3 + 5 + 637 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7872657984 + 3670905744 = 88728^2 + 60588^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11543563721) 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, 40081675 + ... + 40081962.

Almost surely, 2^11543563728 is an apocalyptic number.

11543563728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

11543563728 is an abundant number, since it is smaller than the sum of its proper divisors (20762382386).

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

11543563728 is a wasteful number, since it uses less digits than its factorization.

11543563728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80163651 (or 80163642 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 11543563728 in words is "eleven billion, five hundred forty-three million, five hundred sixty-three thousand, seven hundred twenty-eight".