11543444215 has 4 divisors (see below), whose sum is σ = 13852133064. Its totient is φ = 9234755368.

The previous prime is 11543444197. The next prime is 11543444279. The reversal of 11543444215 is 51244434511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11543444215 - 2³³ = 2953509623 is a prime.

It is a super-2 number, since 2×11543444215² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1154344417 + ... + 1154344426.

It is an arithmetic number, because the mean of its divisors is an integer number (3463033266).

Almost surely, 2^11543444215 is an apocalyptic number.

11543444215 is a deficient number, since it is larger than the sum of its proper divisors (2308688849).

11543444215 is an equidigital number, since it uses as much as digits as its factorization.

11543444215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2308688848.

The product of its digits is 38400, while the sum is 34.

Adding to 11543444215 its reverse (51244434511), we get a palindrome (62787878726).

The spelling of 11543444215 in words is "eleven billion, five hundred forty-three million, four hundred forty-four thousand, two hundred fifteen".