688216873859 has 2 divisors, whose sum is σ = 688216873860. Its totient is φ = 688216873858.

The previous prime is 688216873837. The next prime is 688216873909. The reversal of 688216873859 is 958378612886.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688216873859 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 688216873792 and 688216873801.

It is not a weakly prime, because it can be changed into another prime (688216873759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344108436929 + 344108436930.

It is an arithmetic number, because the mean of its divisors is an integer number (344108436930).

Almost surely, 2^688216873859 is an apocalyptic number.

688216873859 is a deficient number, since it is larger than the sum of its proper divisors (1).

688216873859 is an equidigital number, since it uses as much as digits as its factorization.

688216873859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 278691840, while the sum is 71.

The spelling of 688216873859 in words is "six hundred eighty-eight billion, two hundred sixteen million, eight hundred seventy-three thousand, eight hundred fifty-nine".