688881319349 has 2 divisors, whose sum is σ = 688881319350. Its totient is φ = 688881319348.

The previous prime is 688881319289. The next prime is 688881319381. The reversal of 688881319349 is 943913188886.

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., 687934218724 + 947100625 = 829418^2 + 30775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688881319349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688881319549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344440659674 + 344440659675.

It is an arithmetic number, because the mean of its divisors is an integer number (344440659675).

Almost surely, 2^688881319349 is an apocalyptic number.

It is an amenable number.

688881319349 is a deficient number, since it is larger than the sum of its proper divisors (1).

688881319349 is an equidigital number, since it uses as much as digits as its factorization.

688881319349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71663616, while the sum is 68.

The spelling of 688881319349 in words is "six hundred eighty-eight billion, eight hundred eighty-one million, three hundred nineteen thousand, three hundred forty-nine".