11111555422543 has 8 divisors (see below), whose sum is σ = 11121593324256. Its totient is φ = 11101518588000.

The previous prime is 11111555422453. The next prime is 11111555422559. The reversal of 11111555422543 is 34522455511111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111555422543 - 2¹⁷ = 11111555291471 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111555422496 and 11111555422505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111555422243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21356430 + ... + 21870532.

It is an arithmetic number, because the mean of its divisors is an integer number (1390199165532).

Almost surely, 2^{11111555422543} is an apocalyptic number.

11111555422543 is a deficient number, since it is larger than the sum of its proper divisors (10037901713).

11111555422543 is a wasteful number, since it uses less digits than its factorization.

11111555422543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533585.

The product of its digits is 120000, while the sum is 40.

The spelling of 11111555422543 in words is "eleven trillion, one hundred eleven billion, five hundred fifty-five million, four hundred twenty-two thousand, five hundred forty-three".