255642736717 has 2 divisors, whose sum is σ = 255642736718. Its totient is φ = 255642736716.

The previous prime is 255642736693. The next prime is 255642736721. The reversal of 255642736717 is 717637246552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157366129636 + 98276607081 = 396694^2 + 313491^2 .

It is a cyclic number.

It is not a de Polignac number, because 255642736717 - 2⁷ = 255642736589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255642736787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127821368358 + 127821368359.

It is an arithmetic number, because the mean of its divisors is an integer number (127821368359).

Almost surely, 2^255642736717 is an apocalyptic number.

It is an amenable number.

255642736717 is a deficient number, since it is larger than the sum of its proper divisors (1).

255642736717 is an equidigital number, since it uses as much as digits as its factorization.

255642736717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14817600, while the sum is 55.

The spelling of 255642736717 in words is "two hundred fifty-five billion, six hundred forty-two million, seven hundred thirty-six thousand, seven hundred seventeen".