268240357309 has 2 divisors, whose sum is σ = 268240357310. Its totient is φ = 268240357308.

The previous prime is 268240357303. The next prime is 268240357321. The reversal of 268240357309 is 903753042862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228799588900 + 39440768409 = 478330^2 + 198597^2 .

It is a cyclic number.

It is not a de Polignac number, because 268240357309 - 2¹⁷ = 268240226237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268240357303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134120178654 + 134120178655.

It is an arithmetic number, because the mean of its divisors is an integer number (134120178655).

Almost surely, 2^268240357309 is an apocalyptic number.

It is an amenable number.

268240357309 is a deficient number, since it is larger than the sum of its proper divisors (1).

268240357309 is an equidigital number, since it uses as much as digits as its factorization.

268240357309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 49.

The spelling of 268240357309 in words is "two hundred sixty-eight billion, two hundred forty million, three hundred fifty-seven thousand, three hundred nine".