684316798889 has 2 divisors, whose sum is σ = 684316798890. Its totient is φ = 684316798888.

The previous prime is 684316798727. The next prime is 684316798897. The reversal of 684316798889 is 988897613486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662080024489 + 22236774400 = 813683^2 + 149120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684316798889 is a prime.

It is not a weakly prime, because it can be changed into another prime (684316798289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342158399444 + 342158399445.

It is an arithmetic number, because the mean of its divisors is an integer number (342158399445).

Almost surely, 2^684316798889 is an apocalyptic number.

It is an amenable number.

684316798889 is a deficient number, since it is larger than the sum of its proper divisors (1).

684316798889 is an equidigital number, since it uses as much as digits as its factorization.

684316798889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1003290624, while the sum is 77.

The spelling of 684316798889 in words is "six hundred eighty-four billion, three hundred sixteen million, seven hundred ninety-eight thousand, eight hundred eighty-nine".