689344215689 has 2 divisors, whose sum is σ = 689344215690. Its totient is φ = 689344215688.

The previous prime is 689344215683. The next prime is 689344215739. The reversal of 689344215689 is 986512443986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588135610000 + 101208605689 = 766900^2 + 318133^2 .

It is a cyclic number.

It is not a de Polignac number, because 689344215689 - 2⁸ = 689344215433 is a prime.

It is not a weakly prime, because it can be changed into another prime (689344215683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344672107844 + 344672107845.

It is an arithmetic number, because the mean of its divisors is an integer number (344672107845).

Almost surely, 2^689344215689 is an apocalyptic number.

It is an amenable number.

689344215689 is a deficient number, since it is larger than the sum of its proper divisors (1).

689344215689 is an equidigital number, since it uses as much as digits as its factorization.

689344215689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89579520, while the sum is 65.

The spelling of 689344215689 in words is "six hundred eighty-nine billion, three hundred forty-four million, two hundred fifteen thousand, six hundred eighty-nine".