11865417543 has 16 divisors (see below), whose sum is σ = 20089596160. Its totient is φ = 6780238488.

The previous prime is 11865417527. The next prime is 11865417647. The reversal of 11865417543 is 34571456811.

11865417543 is a `hidden beast` number, since 1 + 1 + 8 + 65 + 41 + 7 + 543 = 666.

It is not a de Polignac number, because 11865417543 - 2⁴ = 11865417527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11865417943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31389805 + ... + 31390182.

It is an arithmetic number, because the mean of its divisors is an integer number (1255599760).

Almost surely, 2^11865417543 is an apocalyptic number.

11865417543 is a deficient number, since it is larger than the sum of its proper divisors (8224178617).

11865417543 is an equidigital number, since it uses as much as digits as its factorization.

11865417543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62780003 (or 62779997 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The spelling of 11865417543 in words is "eleven billion, eight hundred sixty-five million, four hundred seventeen thousand, five hundred forty-three".