16543323861 has 4 divisors (see below), whose sum is σ = 22057765152. Its totient is φ = 11028882572.

The previous prime is 16543323793. The next prime is 16543323869. The reversal of 16543323861 is 16832334561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16543323861 - 2²³ = 16534935253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16543323869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2757220641 + ... + 2757220646.

It is an arithmetic number, because the mean of its divisors is an integer number (5514441288).

Almost surely, 2^16543323861 is an apocalyptic number.

It is an amenable number.

16543323861 is a deficient number, since it is larger than the sum of its proper divisors (5514441291).

16543323861 is an equidigital number, since it uses as much as digits as its factorization.

16543323861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5514441290.

The product of its digits is 311040, while the sum is 42.

The spelling of 16543323861 in words is "sixteen billion, five hundred forty-three million, three hundred twenty-three thousand, eight hundred sixty-one".