268689474289 has 2 divisors, whose sum is σ = 268689474290. Its totient is φ = 268689474288.

The previous prime is 268689474283. The next prime is 268689474299. The reversal of 268689474289 is 982474986862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165010626225 + 103678848064 = 406215^2 + 321992^2 .

It is a cyclic number.

It is not a de Polignac number, because 268689474289 - 2²⁹ = 268152603377 is a prime.

It is a super-3 number, since 3×268689474289³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (268689474283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134344737144 + 134344737145.

It is an arithmetic number, because the mean of its divisors is an integer number (134344737145).

Almost surely, 2^268689474289 is an apocalyptic number.

It is an amenable number.

268689474289 is a deficient number, since it is larger than the sum of its proper divisors (1).

268689474289 is an equidigital number, since it uses as much as digits as its factorization.

268689474289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 668860416, while the sum is 73.

The spelling of 268689474289 in words is "two hundred sixty-eight billion, six hundred eighty-nine million, four hundred seventy-four thousand, two hundred eighty-nine".