16543243503 has 6 divisors (see below), whose sum is σ = 23895796184. Its totient is φ = 11028828996.

The previous prime is 16543243487. The next prime is 16543243543. The reversal of 16543243503 is 30534234561.

It is not a de Polignac number, because 16543243503 - 2⁴ = 16543243487 is a prime.

It is a super-2 number, since 2×16543243503² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16543243543) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 919069075 + ... + 919069092.

Almost surely, 2^16543243503 is an apocalyptic number.

16543243503 is a deficient number, since it is larger than the sum of its proper divisors (7352552681).

16543243503 is a wasteful number, since it uses less digits than its factorization.

16543243503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838138173 (or 1838138170 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The spelling of 16543243503 in words is "sixteen billion, five hundred forty-three million, two hundred forty-three thousand, five hundred three".