689111021012171 has 2 divisors, whose sum is σ = 689111021012172. Its totient is φ = 689111021012170.

The previous prime is 689111021012159. The next prime is 689111021012213. The reversal of 689111021012171 is 171210120111986.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689111021012171 is a prime.

It is not a weakly prime, because it can be changed into another prime (689111021012671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344555510506085 + 344555510506086.

It is an arithmetic number, because the mean of its divisors is an integer number (344555510506086).

Almost surely, 2^{689111021012171} is an apocalyptic number.

689111021012171 is a deficient number, since it is larger than the sum of its proper divisors (1).

689111021012171 is an equidigital number, since it uses as much as digits as its factorization.

689111021012171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 41.

The spelling of 689111021012171 in words is "six hundred eighty-nine trillion, one hundred eleven billion, twenty-one million, twelve thousand, one hundred seventy-one".