11543312550 has 384 divisors, whose sum is σ = 36910494720. Its totient is φ = 2318284800.

The previous prime is 11543312527. The next prime is 11543312567. The reversal of 11543312550 is 5521334511.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 66724264 + ... + 66724436.

It is an arithmetic number, because the mean of its divisors is an integer number (96121080).

Almost surely, 2^11543312550 is an apocalyptic number.

11543312550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11543312550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18455247360).

11543312550 is an abundant number, since it is smaller than the sum of its proper divisors (25367182170).

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

11543312550 is a wasteful number, since it uses less digits than its factorization.

11543312550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

The spelling of 11543312550 in words is "eleven billion, five hundred forty-three million, three hundred twelve thousand, five hundred fifty".