16843806473891 has 4 divisors (see below), whose sum is σ = 17834618619432. Its totient is φ = 15852994328352.

The previous prime is 16843806473803. The next prime is 16843806473903. The reversal of 16843806473891 is 19837460834861.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 16843806473891 - 2⁴² = 12445759962787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16843806473191) 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, 495406072745 + ... + 495406072778.

It is an arithmetic number, because the mean of its divisors is an integer number (4458654654858).

Almost surely, 2^{16843806473891} is an apocalyptic number.

16843806473891 is a deficient number, since it is larger than the sum of its proper divisors (990812145541).

16843806473891 is an equidigital number, since it uses as much as digits as its factorization.

16843806473891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990812145540.

The product of its (nonzero) digits is 167215104, while the sum is 68.

The spelling of 16843806473891 in words is "sixteen trillion, eight hundred forty-three billion, eight hundred six million, four hundred seventy-three thousand, eight hundred ninety-one".