16543831813 has 4 divisors (see below), whose sum is σ = 16947339948. Its totient is φ = 16140323680.

The previous prime is 16543831807. The next prime is 16543831817. The reversal of 16543831813 is 31813834561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8817773409 + 7726058404 = 93903^2 + 87898^2 .

It is a cyclic number.

It is not a de Polignac number, because 16543831813 - 2²¹ = 16541734661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16543831813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16543831817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201754006 + ... + 201754087.

It is an arithmetic number, because the mean of its divisors is an integer number (4236834987).

Almost surely, 2^16543831813 is an apocalyptic number.

It is an amenable number.

16543831813 is a deficient number, since it is larger than the sum of its proper divisors (403508135).

16543831813 is an equidigital number, since it uses as much as digits as its factorization.

16543831813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403508134.

The product of its digits is 207360, while the sum is 43.

The spelling of 16543831813 in words is "sixteen billion, five hundred forty-three million, eight hundred thirty-one thousand, eight hundred thirteen".