689205258949 has 2 divisors, whose sum is σ = 689205258950. Its totient is φ = 689205258948.

The previous prime is 689205258941. The next prime is 689205259013. The reversal of 689205258949 is 949852502986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 547034785924 + 142170473025 = 739618^2 + 377055^2 .

It is a cyclic number.

It is not a de Polignac number, because 689205258949 - 2³ = 689205258941 is a prime.

It is a super-3 number, since 3×689205258949³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689205258941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344602629474 + 344602629475.

It is an arithmetic number, because the mean of its divisors is an integer number (344602629475).

Almost surely, 2^689205258949 is an apocalyptic number.

It is an amenable number.

689205258949 is a deficient number, since it is larger than the sum of its proper divisors (1).

689205258949 is an equidigital number, since it uses as much as digits as its factorization.

689205258949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111974400, while the sum is 67.

The spelling of 689205258949 in words is "six hundred eighty-nine billion, two hundred five million, two hundred fifty-eight thousand, nine hundred forty-nine".