11543256405 has 32 divisors (see below), whose sum is σ = 20535448320. Its totient is φ = 6152172480.

The previous prime is 11543256401. The next prime is 11543256419. The reversal of 11543256405 is 50465234511.

11543256405 is a `hidden beast` number, since 1 + 1 + 5 + 4 + 3 + 2 + 5 + 640 + 5 = 666.

It is not a de Polignac number, because 11543256405 - 2² = 11543256401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11543256405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11543256401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172920 + ... + 230190.

It is an arithmetic number, because the mean of its divisors is an integer number (641732760).

Almost surely, 2^11543256405 is an apocalyptic number.

11543256405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11543256405 is a deficient number, since it is larger than the sum of its proper divisors (8992191915).

11543256405 is a wasteful number, since it uses less digits than its factorization.

11543256405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58778 (or 58772 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 11543256405 in words is "eleven billion, five hundred forty-three million, two hundred fifty-six thousand, four hundred five".