168890817911 has 2 divisors, whose sum is σ = 168890817912. Its totient is φ = 168890817910.

The previous prime is 168890817839. The next prime is 168890818013. The reversal of 168890817911 is 119718098861.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168890817911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168890817811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84445408955 + 84445408956.

It is an arithmetic number, because the mean of its divisors is an integer number (84445408956).

Almost surely, 2^168890817911 is an apocalyptic number.

168890817911 is a deficient number, since it is larger than the sum of its proper divisors (1).

168890817911 is an equidigital number, since it uses as much as digits as its factorization.

168890817911 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 59.

The spelling of 168890817911 in words is "one hundred sixty-eight billion, eight hundred ninety million, eight hundred seventeen thousand, nine hundred eleven".