688193717357 has 2 divisors, whose sum is σ = 688193717358. Its totient is φ = 688193717356.

The previous prime is 688193717347. The next prime is 688193717399. The reversal of 688193717357 is 753717391886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 680643150121 + 7550567236 = 825011^2 + 86894^2 .

It is a cyclic number.

It is not a de Polignac number, because 688193717357 - 2⁶ = 688193717293 is a prime.

It is a super-2 number, since 2×688193717357² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 688193717293 and 688193717302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688193717347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344096858678 + 344096858679.

It is an arithmetic number, because the mean of its divisors is an integer number (344096858679).

Almost surely, 2^688193717357 is an apocalyptic number.

It is an amenable number.

688193717357 is a deficient number, since it is larger than the sum of its proper divisors (1).

688193717357 is an equidigital number, since it uses as much as digits as its factorization.

688193717357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53343360, while the sum is 65.

The spelling of 688193717357 in words is "six hundred eighty-eight billion, one hundred ninety-three million, seven hundred seventeen thousand, three hundred fifty-seven".