16505005543 has 8 divisors (see below), whose sum is σ = 18820187568. Its totient is φ = 14339190144.

The previous prime is 16505005529. The next prime is 16505005603. The reversal of 16505005543 is 34550050561.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16505005543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16505005499 and 16505005508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505005343) 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, 37341421 + ... + 37341862.

It is an arithmetic number, because the mean of its divisors is an integer number (2352523446).

Almost surely, 2^16505005543 is an apocalyptic number.

16505005543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16505005543 is a deficient number, since it is larger than the sum of its proper divisors (2315182025).

16505005543 is a wasteful number, since it uses less digits than its factorization.

16505005543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74683313.

The product of its (nonzero) digits is 45000, while the sum is 34.

The spelling of 16505005543 in words is "sixteen billion, five hundred five million, five thousand, five hundred forty-three".