688617338266 has 64 divisors (see below), whose sum is σ = 1221401825280. Its totient is φ = 287053194240.

The previous prime is 688617338197. The next prime is 688617338309. The reversal of 688617338266 is 662833716886.

It is a junction number, because it is equal to n+sod(n) for n = 688617338198 and 688617338207.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82277730 + ... + 82286098.

It is an arithmetic number, because the mean of its divisors is an integer number (19084403520).

Almost surely, 2^688617338266 is an apocalyptic number.

688617338266 is a deficient number, since it is larger than the sum of its proper divisors (532784487014).

688617338266 is a wasteful number, since it uses less digits than its factorization.

688617338266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10231.

The product of its digits is 83607552, while the sum is 64.

The spelling of 688617338266 in words is "six hundred eighty-eight billion, six hundred seventeen million, three hundred thirty-eight thousand, two hundred sixty-six".