11543520511 has 4 divisors (see below), whose sum is σ = 11591820000. Its totient is φ = 11495221024.

The previous prime is 11543520481. The next prime is 11543520551. The reversal of 11543520511 is 11502534511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11502534511 = 13 ⋅884810347.

It is a cyclic number.

It is not a de Polignac number, because 11543520511 - 2⁵ = 11543520479 is a prime.

It is a super-2 number, since 2×11543520511² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11543520511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11543520551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24149386 + ... + 24149863.

It is an arithmetic number, because the mean of its divisors is an integer number (2897955000).

Almost surely, 2^11543520511 is an apocalyptic number.

11543520511 is a deficient number, since it is larger than the sum of its proper divisors (48299489).

11543520511 is an equidigital number, since it uses as much as digits as its factorization.

11543520511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48299488.

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 11543520511 in words is "eleven billion, five hundred forty-three million, five hundred twenty thousand, five hundred eleven".