11543012520 has 256 divisors, whose sum is σ = 38407219200. Its totient is φ = 2757719040.

The previous prime is 11543012501. The next prime is 11543012521. The reversal of 11543012520 is 2521034511.

It is a happy number.

It is a super-2 number, since 2×11543012520² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (11543012521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7638565 + ... + 7640075.

It is an arithmetic number, because the mean of its divisors is an integer number (150028200).

Almost surely, 2^11543012520 is an apocalyptic number.

11543012520 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 11543012520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19203609600).

11543012520 is an abundant number, since it is smaller than the sum of its proper divisors (26864206680).

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

11543012520 is a wasteful number, since it uses less digits than its factorization.

11543012520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 11543012520 in words is "eleven billion, five hundred forty-three million, twelve thousand, five hundred twenty".