11565516543 has 32 divisors (see below), whose sum is σ = 18982656000. Its totient is φ = 6115417056.

The previous prime is 11565516541. The next prime is 11565516553. The reversal of 11565516543 is 34561556511.

It is not a de Polignac number, because 11565516543 - 2¹ = 11565516541 is a prime.

It is a super-2 number, since 2×11565516543² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11565516495 and 11565516504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11565516541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 319893 + ... + 354206.

It is an arithmetic number, because the mean of its divisors is an integer number (593208000).

Almost surely, 2^11565516543 is an apocalyptic number.

11565516543 is a deficient number, since it is larger than the sum of its proper divisors (7417139457).

11565516543 is a wasteful number, since it uses less digits than its factorization.

11565516543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674171.

The product of its digits is 270000, while the sum is 42.

The spelling of 11565516543 in words is "eleven billion, five hundred sixty-five million, five hundred sixteen thousand, five hundred forty-three".