16891841070989 has 2 divisors, whose sum is σ = 16891841070990. Its totient is φ = 16891841070988.

The previous prime is 16891841070943. The next prime is 16891841071013. The reversal of 16891841070989 is 98907014819861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16561302315364 + 330538755625 = 4069558^2 + 574925^2 .

It is a cyclic number.

It is not a de Polignac number, because 16891841070989 - 2¹⁶ = 16891841005453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16891841070919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8445920535494 + 8445920535495.

It is an arithmetic number, because the mean of its divisors is an integer number (8445920535495).

Almost surely, 2^{16891841070989} is an apocalyptic number.

It is an amenable number.

16891841070989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16891841070989 is an equidigital number, since it uses as much as digits as its factorization.

16891841070989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62705664, while the sum is 71.

The spelling of 16891841070989 in words is "sixteen trillion, eight hundred ninety-one billion, eight hundred forty-one million, seventy thousand, nine hundred eighty-nine".