705688359689 has 2 divisors, whose sum is σ = 705688359690. Its totient is φ = 705688359688.

The previous prime is 705688359631. The next prime is 705688359757. The reversal of 705688359689 is 986953886507.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 670911704464 + 34776655225 = 819092^2 + 186485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-705688359689 is a prime.

It is a super-2 number, since 2×705688359689² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (705688359289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352844179844 + 352844179845.

It is an arithmetic number, because the mean of its divisors is an integer number (352844179845).

Almost surely, 2^705688359689 is an apocalyptic number.

It is an amenable number.

705688359689 is a deficient number, since it is larger than the sum of its proper divisors (1).

705688359689 is an equidigital number, since it uses as much as digits as its factorization.

705688359689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 783820800, while the sum is 74.

The spelling of 705688359689 in words is "seven hundred five billion, six hundred eighty-eight million, three hundred fifty-nine thousand, six hundred eighty-nine".