16891841070991 has 4 divisors (see below), whose sum is σ = 17129754325584. Its totient is φ = 16653927816400.

The previous prime is 16891841070989. The next prime is 16891841071013. The reversal of 16891841070991 is 19907014819861.

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 16891841070991 - 2¹ = 16891841070989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16891841070931) 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, 118956627190 + ... + 118956627331.

It is an arithmetic number, because the mean of its divisors is an integer number (4282438581396).

Almost surely, 2^{16891841070991} is an apocalyptic number.

16891841070991 is a deficient number, since it is larger than the sum of its proper divisors (237913254593).

16891841070991 is an equidigital number, since it uses as much as digits as its factorization.

16891841070991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237913254592.

The product of its (nonzero) digits is 7838208, while the sum is 64.

The spelling of 16891841070991 in words is "sixteen trillion, eight hundred ninety-one billion, eight hundred forty-one million, seventy thousand, nine hundred ninety-one".